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" | |
2c8dccc7 | 22 | #include "led.h" |
33b64eb2 | 23 | #include "mesh.h" |
571ecf67 JB |
24 | #include "wep.h" |
25 | #include "wpa.h" | |
26 | #include "tkip.h" | |
27 | #include "wme.h" | |
28 | ||
c6a1fa12 JB |
29 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
30 | struct tid_ampdu_rx *tid_agg_rx, | |
31 | struct sk_buff *skb, | |
32 | u16 mpdu_seq_num, | |
33 | int bar_req); | |
b2e7771e JB |
34 | /* |
35 | * monitor mode reception | |
36 | * | |
37 | * This function cleans up the SKB, i.e. it removes all the stuff | |
38 | * only useful for monitoring. | |
39 | */ | |
40 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, | |
41 | struct sk_buff *skb, | |
42 | int rtap_len) | |
43 | { | |
44 | skb_pull(skb, rtap_len); | |
45 | ||
46 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { | |
47 | if (likely(skb->len > FCS_LEN)) | |
48 | skb_trim(skb, skb->len - FCS_LEN); | |
49 | else { | |
50 | /* driver bug */ | |
51 | WARN_ON(1); | |
52 | dev_kfree_skb(skb); | |
53 | skb = NULL; | |
54 | } | |
55 | } | |
56 | ||
57 | return skb; | |
58 | } | |
59 | ||
60 | static inline int should_drop_frame(struct ieee80211_rx_status *status, | |
61 | struct sk_buff *skb, | |
62 | int present_fcs_len, | |
63 | int radiotap_len) | |
64 | { | |
182503ab | 65 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
b2e7771e JB |
66 | |
67 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) | |
68 | return 1; | |
69 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) | |
70 | return 1; | |
87228f57 HH |
71 | if (ieee80211_is_ctl(hdr->frame_control) && |
72 | !ieee80211_is_pspoll(hdr->frame_control) && | |
73 | !ieee80211_is_back_req(hdr->frame_control)) | |
b2e7771e JB |
74 | return 1; |
75 | return 0; | |
76 | } | |
77 | ||
601ae7f2 BR |
78 | static int |
79 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, | |
80 | struct ieee80211_rx_status *status) | |
81 | { | |
82 | int len; | |
83 | ||
84 | /* always present fields */ | |
85 | len = sizeof(struct ieee80211_radiotap_header) + 9; | |
86 | ||
87 | if (status->flag & RX_FLAG_TSFT) | |
88 | len += 8; | |
7fee5372 | 89 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
601ae7f2 BR |
90 | len += 1; |
91 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) | |
92 | len += 1; | |
93 | ||
94 | if (len & 1) /* padding for RX_FLAGS if necessary */ | |
95 | len++; | |
96 | ||
97 | /* make sure radiotap starts at a naturally aligned address */ | |
98 | if (len % 8) | |
99 | len = roundup(len, 8); | |
100 | ||
101 | return len; | |
102 | } | |
103 | ||
d1c3a37c | 104 | /* |
601ae7f2 BR |
105 | * ieee80211_add_rx_radiotap_header - add radiotap header |
106 | * | |
107 | * add a radiotap header containing all the fields which the hardware provided. | |
108 | */ | |
109 | static void | |
110 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, | |
111 | struct sk_buff *skb, | |
112 | struct ieee80211_rx_status *status, | |
113 | struct ieee80211_rate *rate, | |
114 | int rtap_len) | |
115 | { | |
116 | struct ieee80211_radiotap_header *rthdr; | |
117 | unsigned char *pos; | |
118 | ||
119 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); | |
120 | memset(rthdr, 0, rtap_len); | |
121 | ||
122 | /* radiotap header, set always present flags */ | |
123 | rthdr->it_present = | |
124 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
601ae7f2 BR |
125 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
126 | (1 << IEEE80211_RADIOTAP_ANTENNA) | | |
127 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); | |
128 | rthdr->it_len = cpu_to_le16(rtap_len); | |
129 | ||
130 | pos = (unsigned char *)(rthdr+1); | |
131 | ||
132 | /* the order of the following fields is important */ | |
133 | ||
134 | /* IEEE80211_RADIOTAP_TSFT */ | |
135 | if (status->flag & RX_FLAG_TSFT) { | |
136 | *(__le64 *)pos = cpu_to_le64(status->mactime); | |
137 | rthdr->it_present |= | |
138 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); | |
139 | pos += 8; | |
140 | } | |
141 | ||
142 | /* IEEE80211_RADIOTAP_FLAGS */ | |
143 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
144 | *pos |= IEEE80211_RADIOTAP_F_FCS; | |
aae89831 JB |
145 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
146 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; | |
b4f28bbb BR |
147 | if (status->flag & RX_FLAG_SHORTPRE) |
148 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; | |
601ae7f2 BR |
149 | pos++; |
150 | ||
151 | /* IEEE80211_RADIOTAP_RATE */ | |
0fb8ca45 JM |
152 | if (status->flag & RX_FLAG_HT) { |
153 | /* | |
154 | * TODO: add following information into radiotap header once | |
155 | * suitable fields are defined for it: | |
156 | * - MCS index (status->rate_idx) | |
157 | * - HT40 (status->flag & RX_FLAG_40MHZ) | |
158 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) | |
159 | */ | |
160 | *pos = 0; | |
8d6f658e | 161 | } else { |
ebe6c7ba | 162 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
0fb8ca45 | 163 | *pos = rate->bitrate / 5; |
8d6f658e | 164 | } |
601ae7f2 BR |
165 | pos++; |
166 | ||
167 | /* IEEE80211_RADIOTAP_CHANNEL */ | |
168 | *(__le16 *)pos = cpu_to_le16(status->freq); | |
169 | pos += 2; | |
170 | if (status->band == IEEE80211_BAND_5GHZ) | |
171 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
172 | IEEE80211_CHAN_5GHZ); | |
9deb1ae5 BR |
173 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
174 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
175 | IEEE80211_CHAN_2GHZ); | |
601ae7f2 | 176 | else |
9deb1ae5 | 177 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
601ae7f2 BR |
178 | IEEE80211_CHAN_2GHZ); |
179 | pos += 2; | |
180 | ||
181 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ | |
182 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { | |
183 | *pos = status->signal; | |
184 | rthdr->it_present |= | |
185 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); | |
186 | pos++; | |
187 | } | |
188 | ||
189 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ | |
190 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { | |
191 | *pos = status->noise; | |
192 | rthdr->it_present |= | |
193 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); | |
194 | pos++; | |
195 | } | |
196 | ||
197 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ | |
198 | ||
199 | /* IEEE80211_RADIOTAP_ANTENNA */ | |
200 | *pos = status->antenna; | |
201 | pos++; | |
202 | ||
601ae7f2 BR |
203 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
204 | ||
205 | /* IEEE80211_RADIOTAP_RX_FLAGS */ | |
206 | /* ensure 2 byte alignment for the 2 byte field as required */ | |
207 | if ((pos - (unsigned char *)rthdr) & 1) | |
208 | pos++; | |
aae89831 JB |
209 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
210 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP); | |
601ae7f2 BR |
211 | pos += 2; |
212 | } | |
213 | ||
b2e7771e JB |
214 | /* |
215 | * This function copies a received frame to all monitor interfaces and | |
216 | * returns a cleaned-up SKB that no longer includes the FCS nor the | |
217 | * radiotap header the driver might have added. | |
218 | */ | |
219 | static struct sk_buff * | |
220 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, | |
8318d78a JB |
221 | struct ieee80211_rx_status *status, |
222 | struct ieee80211_rate *rate) | |
b2e7771e JB |
223 | { |
224 | struct ieee80211_sub_if_data *sdata; | |
b2e7771e | 225 | int needed_headroom = 0; |
b2e7771e JB |
226 | struct sk_buff *skb, *skb2; |
227 | struct net_device *prev_dev = NULL; | |
228 | int present_fcs_len = 0; | |
229 | int rtap_len = 0; | |
230 | ||
231 | /* | |
232 | * First, we may need to make a copy of the skb because | |
233 | * (1) we need to modify it for radiotap (if not present), and | |
234 | * (2) the other RX handlers will modify the skb we got. | |
235 | * | |
236 | * We don't need to, of course, if we aren't going to return | |
237 | * the SKB because it has a bad FCS/PLCP checksum. | |
238 | */ | |
239 | if (status->flag & RX_FLAG_RADIOTAP) | |
240 | rtap_len = ieee80211_get_radiotap_len(origskb->data); | |
241 | else | |
601ae7f2 BR |
242 | /* room for the radiotap header based on driver features */ |
243 | needed_headroom = ieee80211_rx_radiotap_len(local, status); | |
b2e7771e JB |
244 | |
245 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) | |
246 | present_fcs_len = FCS_LEN; | |
247 | ||
248 | if (!local->monitors) { | |
249 | if (should_drop_frame(status, origskb, present_fcs_len, | |
250 | rtap_len)) { | |
251 | dev_kfree_skb(origskb); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | return remove_monitor_info(local, origskb, rtap_len); | |
256 | } | |
257 | ||
258 | if (should_drop_frame(status, origskb, present_fcs_len, rtap_len)) { | |
259 | /* only need to expand headroom if necessary */ | |
260 | skb = origskb; | |
261 | origskb = NULL; | |
262 | ||
263 | /* | |
264 | * This shouldn't trigger often because most devices have an | |
265 | * RX header they pull before we get here, and that should | |
266 | * be big enough for our radiotap information. We should | |
267 | * probably export the length to drivers so that we can have | |
268 | * them allocate enough headroom to start with. | |
269 | */ | |
270 | if (skb_headroom(skb) < needed_headroom && | |
c49e5ea3 | 271 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
b2e7771e JB |
272 | dev_kfree_skb(skb); |
273 | return NULL; | |
274 | } | |
275 | } else { | |
276 | /* | |
277 | * Need to make a copy and possibly remove radiotap header | |
278 | * and FCS from the original. | |
279 | */ | |
280 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); | |
281 | ||
282 | origskb = remove_monitor_info(local, origskb, rtap_len); | |
283 | ||
284 | if (!skb) | |
285 | return origskb; | |
286 | } | |
287 | ||
288 | /* if necessary, prepend radiotap information */ | |
601ae7f2 BR |
289 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
290 | ieee80211_add_rx_radiotap_header(local, skb, status, rate, | |
291 | needed_headroom); | |
b2e7771e | 292 | |
ce3edf6d | 293 | skb_reset_mac_header(skb); |
b2e7771e JB |
294 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
295 | skb->pkt_type = PACKET_OTHERHOST; | |
296 | skb->protocol = htons(ETH_P_802_2); | |
297 | ||
298 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
299 | if (!netif_running(sdata->dev)) | |
300 | continue; | |
301 | ||
05c914fe | 302 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
303 | continue; |
304 | ||
3d30d949 MW |
305 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
306 | continue; | |
307 | ||
b2e7771e JB |
308 | if (prev_dev) { |
309 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
310 | if (skb2) { | |
311 | skb2->dev = prev_dev; | |
312 | netif_rx(skb2); | |
313 | } | |
314 | } | |
315 | ||
316 | prev_dev = sdata->dev; | |
317 | sdata->dev->stats.rx_packets++; | |
318 | sdata->dev->stats.rx_bytes += skb->len; | |
319 | } | |
320 | ||
321 | if (prev_dev) { | |
322 | skb->dev = prev_dev; | |
323 | netif_rx(skb); | |
324 | } else | |
325 | dev_kfree_skb(skb); | |
326 | ||
327 | return origskb; | |
328 | } | |
329 | ||
330 | ||
5cf121c3 | 331 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
6e0d114d | 332 | { |
238f74a2 | 333 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
6e0d114d JB |
334 | int tid; |
335 | ||
336 | /* does the frame have a qos control field? */ | |
238f74a2 HH |
337 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
338 | u8 *qc = ieee80211_get_qos_ctl(hdr); | |
6e0d114d | 339 | /* frame has qos control */ |
238f74a2 HH |
340 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
341 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) | |
5cf121c3 | 342 | rx->flags |= IEEE80211_RX_AMSDU; |
fd4c7f2f | 343 | else |
5cf121c3 | 344 | rx->flags &= ~IEEE80211_RX_AMSDU; |
6e0d114d | 345 | } else { |
1411f9b5 JB |
346 | /* |
347 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): | |
348 | * | |
349 | * Sequence numbers for management frames, QoS data | |
350 | * frames with a broadcast/multicast address in the | |
351 | * Address 1 field, and all non-QoS data frames sent | |
352 | * by QoS STAs are assigned using an additional single | |
353 | * modulo-4096 counter, [...] | |
354 | * | |
355 | * We also use that counter for non-QoS STAs. | |
356 | */ | |
357 | tid = NUM_RX_DATA_QUEUES - 1; | |
6e0d114d | 358 | } |
52865dfd | 359 | |
5cf121c3 | 360 | rx->queue = tid; |
6e0d114d JB |
361 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
362 | * For now, set skb->priority to 0 for other cases. */ | |
363 | rx->skb->priority = (tid > 7) ? 0 : tid; | |
38f3714d | 364 | } |
6e0d114d | 365 | |
d1c3a37c JB |
366 | /** |
367 | * DOC: Packet alignment | |
368 | * | |
369 | * Drivers always need to pass packets that are aligned to two-byte boundaries | |
370 | * to the stack. | |
371 | * | |
372 | * Additionally, should, if possible, align the payload data in a way that | |
373 | * guarantees that the contained IP header is aligned to a four-byte | |
374 | * boundary. In the case of regular frames, this simply means aligning the | |
375 | * payload to a four-byte boundary (because either the IP header is directly | |
376 | * contained, or IV/RFC1042 headers that have a length divisible by four are | |
377 | * in front of it). | |
378 | * | |
379 | * With A-MSDU frames, however, the payload data address must yield two modulo | |
380 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that | |
381 | * push the IP header further back to a multiple of four again. Thankfully, the | |
382 | * specs were sane enough this time around to require padding each A-MSDU | |
383 | * subframe to a length that is a multiple of four. | |
384 | * | |
385 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and | |
386 | * the payload is not supported, the driver is required to move the 802.11 | |
387 | * header to be directly in front of the payload in that case. | |
388 | */ | |
389 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) | |
38f3714d | 390 | { |
a7767f95 | 391 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
38f3714d JB |
392 | int hdrlen; |
393 | ||
d1c3a37c JB |
394 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
395 | return; | |
396 | #endif | |
397 | ||
398 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, | |
399 | "unaligned packet at 0x%p\n", rx->skb->data)) | |
400 | return; | |
401 | ||
a7767f95 | 402 | if (!ieee80211_is_data_present(hdr->frame_control)) |
38f3714d JB |
403 | return; |
404 | ||
a7767f95 | 405 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
5cf121c3 | 406 | if (rx->flags & IEEE80211_RX_AMSDU) |
38f3714d | 407 | hdrlen += ETH_HLEN; |
d1c3a37c JB |
408 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
409 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); | |
6e0d114d JB |
410 | } |
411 | ||
6368e4b1 | 412 | |
571ecf67 JB |
413 | /* rx handlers */ |
414 | ||
49461622 | 415 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 416 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
571ecf67 JB |
417 | { |
418 | struct ieee80211_local *local = rx->local; | |
419 | struct sk_buff *skb = rx->skb; | |
420 | ||
c2b13452 JB |
421 | if (unlikely(local->hw_scanning)) |
422 | return ieee80211_scan_rx(rx->sdata, skb, rx->status); | |
ece8eddd | 423 | |
c2b13452 | 424 | if (unlikely(local->sw_scanning)) { |
ece8eddd | 425 | /* drop all the other packets during a software scan anyway */ |
c2b13452 | 426 | if (ieee80211_scan_rx(rx->sdata, skb, rx->status) |
9ae54c84 | 427 | != RX_QUEUED) |
ece8eddd | 428 | dev_kfree_skb(skb); |
9ae54c84 | 429 | return RX_QUEUED; |
571ecf67 JB |
430 | } |
431 | ||
5cf121c3 | 432 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
571ecf67 JB |
433 | /* scanning finished during invoking of handlers */ |
434 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); | |
e4c26add | 435 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
436 | } |
437 | ||
9ae54c84 | 438 | return RX_CONTINUE; |
571ecf67 JB |
439 | } |
440 | ||
3cfcf6ac JM |
441 | |
442 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) | |
443 | { | |
444 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
445 | ||
446 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) | |
447 | return 0; | |
448 | ||
449 | return ieee80211_is_robust_mgmt_frame(hdr); | |
450 | } | |
451 | ||
452 | ||
453 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) | |
454 | { | |
455 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
456 | ||
457 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) | |
458 | return 0; | |
459 | ||
460 | return ieee80211_is_robust_mgmt_frame(hdr); | |
461 | } | |
462 | ||
463 | ||
464 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ | |
465 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) | |
466 | { | |
467 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; | |
468 | struct ieee80211_mmie *mmie; | |
469 | ||
470 | if (skb->len < 24 + sizeof(*mmie) || | |
471 | !is_multicast_ether_addr(hdr->da)) | |
472 | return -1; | |
473 | ||
474 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) | |
475 | return -1; /* not a robust management frame */ | |
476 | ||
477 | mmie = (struct ieee80211_mmie *) | |
478 | (skb->data + skb->len - sizeof(*mmie)); | |
479 | if (mmie->element_id != WLAN_EID_MMIE || | |
480 | mmie->length != sizeof(*mmie) - 2) | |
481 | return -1; | |
482 | ||
483 | return le16_to_cpu(mmie->key_id); | |
484 | } | |
485 | ||
486 | ||
33b64eb2 | 487 | static ieee80211_rx_result |
5cf121c3 | 488 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
33b64eb2 | 489 | { |
a7767f95 HH |
490 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
491 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
d6d1a5a7 | 492 | |
a7767f95 HH |
493 | if (ieee80211_is_data(hdr->frame_control)) { |
494 | if (!ieee80211_has_a4(hdr->frame_control)) | |
33b64eb2 LCC |
495 | return RX_DROP_MONITOR; |
496 | if (memcmp(hdr->addr4, rx->dev->dev_addr, ETH_ALEN) == 0) | |
497 | return RX_DROP_MONITOR; | |
498 | } | |
499 | ||
500 | /* If there is not an established peer link and this is not a peer link | |
501 | * establisment frame, beacon or probe, drop the frame. | |
502 | */ | |
503 | ||
b4e08ea1 | 504 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
33b64eb2 | 505 | struct ieee80211_mgmt *mgmt; |
d6d1a5a7 | 506 | |
a7767f95 | 507 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
33b64eb2 LCC |
508 | return RX_DROP_MONITOR; |
509 | ||
a7767f95 | 510 | if (ieee80211_is_action(hdr->frame_control)) { |
33b64eb2 LCC |
511 | mgmt = (struct ieee80211_mgmt *)hdr; |
512 | if (mgmt->u.action.category != PLINK_CATEGORY) | |
513 | return RX_DROP_MONITOR; | |
33b64eb2 | 514 | return RX_CONTINUE; |
33b64eb2 LCC |
515 | } |
516 | ||
a7767f95 HH |
517 | if (ieee80211_is_probe_req(hdr->frame_control) || |
518 | ieee80211_is_probe_resp(hdr->frame_control) || | |
519 | ieee80211_is_beacon(hdr->frame_control)) | |
520 | return RX_CONTINUE; | |
521 | ||
522 | return RX_DROP_MONITOR; | |
523 | ||
524 | } | |
525 | ||
526 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) | |
527 | ||
528 | if (ieee80211_is_data(hdr->frame_control) && | |
529 | is_multicast_ether_addr(hdr->addr1) && | |
f698d856 | 530 | mesh_rmc_check(hdr->addr4, msh_h_get(hdr, hdrlen), rx->sdata)) |
33b64eb2 | 531 | return RX_DROP_MONITOR; |
902acc78 | 532 | #undef msh_h_get |
d6d1a5a7 | 533 | |
902acc78 JB |
534 | return RX_CONTINUE; |
535 | } | |
33b64eb2 LCC |
536 | |
537 | ||
49461622 | 538 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 539 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
571ecf67 | 540 | { |
a7767f95 | 541 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
542 | |
543 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ | |
544 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { | |
a7767f95 | 545 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
5cf121c3 | 546 | rx->sta->last_seq_ctrl[rx->queue] == |
571ecf67 | 547 | hdr->seq_ctrl)) { |
5cf121c3 | 548 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
571ecf67 JB |
549 | rx->local->dot11FrameDuplicateCount++; |
550 | rx->sta->num_duplicates++; | |
551 | } | |
e4c26add | 552 | return RX_DROP_MONITOR; |
571ecf67 | 553 | } else |
5cf121c3 | 554 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
571ecf67 JB |
555 | } |
556 | ||
571ecf67 JB |
557 | if (unlikely(rx->skb->len < 16)) { |
558 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); | |
e4c26add | 559 | return RX_DROP_MONITOR; |
571ecf67 JB |
560 | } |
561 | ||
571ecf67 JB |
562 | /* Drop disallowed frame classes based on STA auth/assoc state; |
563 | * IEEE 802.11, Chap 5.5. | |
564 | * | |
ccd7b362 JB |
565 | * mac80211 filters only based on association state, i.e. it drops |
566 | * Class 3 frames from not associated stations. hostapd sends | |
571ecf67 JB |
567 | * deauth/disassoc frames when needed. In addition, hostapd is |
568 | * responsible for filtering on both auth and assoc states. | |
569 | */ | |
33b64eb2 | 570 | |
902acc78 | 571 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
33b64eb2 | 572 | return ieee80211_rx_mesh_check(rx); |
33b64eb2 | 573 | |
a7767f95 HH |
574 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
575 | ieee80211_is_pspoll(hdr->frame_control)) && | |
05c914fe | 576 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
07346f81 | 577 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
a7767f95 HH |
578 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
579 | !ieee80211_has_tods(hdr->frame_control) && | |
580 | ieee80211_is_data(hdr->frame_control)) || | |
581 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { | |
571ecf67 JB |
582 | /* Drop IBSS frames and frames for other hosts |
583 | * silently. */ | |
e4c26add | 584 | return RX_DROP_MONITOR; |
571ecf67 JB |
585 | } |
586 | ||
e4c26add | 587 | return RX_DROP_MONITOR; |
571ecf67 JB |
588 | } |
589 | ||
9ae54c84 | 590 | return RX_CONTINUE; |
570bd537 JB |
591 | } |
592 | ||
593 | ||
49461622 | 594 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 595 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
570bd537 | 596 | { |
a7767f95 | 597 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
3017b80b JB |
598 | int keyidx; |
599 | int hdrlen; | |
e4c26add | 600 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
d4e46a3d | 601 | struct ieee80211_key *stakey = NULL; |
3cfcf6ac | 602 | int mmie_keyidx = -1; |
570bd537 | 603 | |
3017b80b JB |
604 | /* |
605 | * Key selection 101 | |
606 | * | |
3cfcf6ac | 607 | * There are four types of keys: |
3017b80b | 608 | * - GTK (group keys) |
3cfcf6ac | 609 | * - IGTK (group keys for management frames) |
3017b80b JB |
610 | * - PTK (pairwise keys) |
611 | * - STK (station-to-station pairwise keys) | |
612 | * | |
613 | * When selecting a key, we have to distinguish between multicast | |
614 | * (including broadcast) and unicast frames, the latter can only | |
3cfcf6ac JM |
615 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
616 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then | |
617 | * unicast frames can also use key indices like GTKs. Hence, if we | |
618 | * don't have a PTK/STK we check the key index for a WEP key. | |
3017b80b | 619 | * |
8dc06a1c JB |
620 | * Note that in a regular BSS, multicast frames are sent by the |
621 | * AP only, associated stations unicast the frame to the AP first | |
622 | * which then multicasts it on their behalf. | |
623 | * | |
3017b80b JB |
624 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
625 | * with each station, that is something we don't currently handle. | |
8dc06a1c JB |
626 | * The spec seems to expect that one negotiates the same key with |
627 | * every station but there's no such requirement; VLANs could be | |
628 | * possible. | |
3017b80b JB |
629 | */ |
630 | ||
3cfcf6ac JM |
631 | if (!ieee80211_has_protected(hdr->frame_control)) { |
632 | if (!ieee80211_is_mgmt(hdr->frame_control) || | |
633 | rx->sta == NULL || !test_sta_flags(rx->sta, WLAN_STA_MFP)) | |
634 | return RX_CONTINUE; | |
635 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); | |
636 | if (mmie_keyidx < 0) | |
637 | return RX_CONTINUE; | |
638 | } | |
571ecf67 | 639 | |
3017b80b | 640 | /* |
1990af8d | 641 | * No point in finding a key and decrypting if the frame is neither |
3017b80b JB |
642 | * addressed to us nor a multicast frame. |
643 | */ | |
5cf121c3 | 644 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 645 | return RX_CONTINUE; |
3017b80b | 646 | |
d4e46a3d JB |
647 | if (rx->sta) |
648 | stakey = rcu_dereference(rx->sta->key); | |
649 | ||
650 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { | |
651 | rx->key = stakey; | |
3cfcf6ac JM |
652 | } else if (mmie_keyidx >= 0) { |
653 | /* Broadcast/multicast robust management frame / BIP */ | |
654 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && | |
655 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
656 | return RX_CONTINUE; | |
657 | ||
658 | if (mmie_keyidx < NUM_DEFAULT_KEYS || | |
659 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) | |
660 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ | |
661 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); | |
571ecf67 | 662 | } else { |
3017b80b JB |
663 | /* |
664 | * The device doesn't give us the IV so we won't be | |
665 | * able to look up the key. That's ok though, we | |
666 | * don't need to decrypt the frame, we just won't | |
667 | * be able to keep statistics accurate. | |
668 | * Except for key threshold notifications, should | |
669 | * we somehow allow the driver to tell us which key | |
670 | * the hardware used if this flag is set? | |
671 | */ | |
5cf121c3 JB |
672 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
673 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 674 | return RX_CONTINUE; |
3017b80b | 675 | |
a7767f95 | 676 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
3017b80b JB |
677 | |
678 | if (rx->skb->len < 8 + hdrlen) | |
e4c26add | 679 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
3017b80b JB |
680 | |
681 | /* | |
682 | * no need to call ieee80211_wep_get_keyidx, | |
683 | * it verifies a bunch of things we've done already | |
684 | */ | |
685 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
686 | ||
d4e46a3d | 687 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
3017b80b JB |
688 | |
689 | /* | |
690 | * RSNA-protected unicast frames should always be sent with | |
691 | * pairwise or station-to-station keys, but for WEP we allow | |
692 | * using a key index as well. | |
693 | */ | |
8f20fc24 | 694 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
3017b80b JB |
695 | !is_multicast_ether_addr(hdr->addr1)) |
696 | rx->key = NULL; | |
571ecf67 JB |
697 | } |
698 | ||
3017b80b | 699 | if (rx->key) { |
571ecf67 | 700 | rx->key->tx_rx_count++; |
011bfcc4 | 701 | /* TODO: add threshold stuff again */ |
1990af8d | 702 | } else { |
e4c26add | 703 | return RX_DROP_MONITOR; |
70f08765 JB |
704 | } |
705 | ||
1990af8d JB |
706 | /* Check for weak IVs if possible */ |
707 | if (rx->sta && rx->key->conf.alg == ALG_WEP && | |
a7767f95 | 708 | ieee80211_is_data(hdr->frame_control) && |
5cf121c3 JB |
709 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
710 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && | |
1990af8d JB |
711 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
712 | rx->sta->wep_weak_iv_count++; | |
713 | ||
70f08765 JB |
714 | switch (rx->key->conf.alg) { |
715 | case ALG_WEP: | |
e2f036da MN |
716 | result = ieee80211_crypto_wep_decrypt(rx); |
717 | break; | |
70f08765 | 718 | case ALG_TKIP: |
e2f036da MN |
719 | result = ieee80211_crypto_tkip_decrypt(rx); |
720 | break; | |
70f08765 | 721 | case ALG_CCMP: |
e2f036da MN |
722 | result = ieee80211_crypto_ccmp_decrypt(rx); |
723 | break; | |
3cfcf6ac JM |
724 | case ALG_AES_CMAC: |
725 | result = ieee80211_crypto_aes_cmac_decrypt(rx); | |
726 | break; | |
70f08765 JB |
727 | } |
728 | ||
e2f036da | 729 | /* either the frame has been decrypted or will be dropped */ |
5cf121c3 | 730 | rx->status->flag |= RX_FLAG_DECRYPTED; |
e2f036da MN |
731 | |
732 | return result; | |
70f08765 JB |
733 | } |
734 | ||
572e0012 KV |
735 | static ieee80211_rx_result debug_noinline |
736 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) | |
737 | { | |
738 | struct ieee80211_local *local; | |
739 | struct ieee80211_hdr *hdr; | |
740 | struct sk_buff *skb; | |
741 | ||
742 | local = rx->local; | |
743 | skb = rx->skb; | |
744 | hdr = (struct ieee80211_hdr *) skb->data; | |
745 | ||
746 | if (!local->pspolling) | |
747 | return RX_CONTINUE; | |
748 | ||
749 | if (!ieee80211_has_fromds(hdr->frame_control)) | |
750 | /* this is not from AP */ | |
751 | return RX_CONTINUE; | |
752 | ||
753 | if (!ieee80211_is_data(hdr->frame_control)) | |
754 | return RX_CONTINUE; | |
755 | ||
756 | if (!ieee80211_has_moredata(hdr->frame_control)) { | |
757 | /* AP has no more frames buffered for us */ | |
758 | local->pspolling = false; | |
759 | return RX_CONTINUE; | |
760 | } | |
761 | ||
762 | /* more data bit is set, let's request a new frame from the AP */ | |
763 | ieee80211_send_pspoll(local, rx->sdata); | |
764 | ||
765 | return RX_CONTINUE; | |
766 | } | |
767 | ||
133b8226 | 768 | static void ap_sta_ps_start(struct sta_info *sta) |
571ecf67 | 769 | { |
133b8226 | 770 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
4571d3bf | 771 | struct ieee80211_local *local = sdata->local; |
0795af57 | 772 | |
3e122be0 | 773 | atomic_inc(&sdata->bss->num_sta_ps); |
07346f81 | 774 | set_and_clear_sta_flags(sta, WLAN_STA_PS, WLAN_STA_PSPOLL); |
89fad578 CL |
775 | if (local->ops->sta_notify) |
776 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
777 | STA_NOTIFY_SLEEP, &sta->sta); | |
571ecf67 | 778 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
779 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
780 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 JB |
781 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
782 | } | |
783 | ||
133b8226 | 784 | static int ap_sta_ps_end(struct sta_info *sta) |
571ecf67 | 785 | { |
133b8226 JB |
786 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
787 | struct ieee80211_local *local = sdata->local; | |
571ecf67 JB |
788 | struct sk_buff *skb; |
789 | int sent = 0; | |
571ecf67 | 790 | |
3e122be0 | 791 | atomic_dec(&sdata->bss->num_sta_ps); |
004c872e | 792 | |
07346f81 | 793 | clear_sta_flags(sta, WLAN_STA_PS | WLAN_STA_PSPOLL); |
89fad578 CL |
794 | if (local->ops->sta_notify) |
795 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
796 | STA_NOTIFY_AWAKE, &sta->sta); | |
004c872e JB |
797 | |
798 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
799 | sta_info_clear_tim_bit(sta); | |
800 | ||
571ecf67 | 801 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
802 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
803 | sdata->dev->name, sta->sta.addr, sta->sta.aid); | |
571ecf67 | 804 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
004c872e | 805 | |
571ecf67 JB |
806 | /* Send all buffered frames to the station */ |
807 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { | |
571ecf67 | 808 | sent++; |
8b30b1fe | 809 | skb->requeue = 1; |
571ecf67 JB |
810 | dev_queue_xmit(skb); |
811 | } | |
812 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
571ecf67 JB |
813 | local->total_ps_buffered--; |
814 | sent++; | |
815 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 | 816 | printk(KERN_DEBUG "%s: STA %pM aid %d send PS frame " |
133b8226 | 817 | "since STA not sleeping anymore\n", sdata->dev->name, |
0c68ae26 | 818 | sta->sta.addr, sta->sta.aid); |
571ecf67 | 819 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
8b30b1fe | 820 | skb->requeue = 1; |
571ecf67 JB |
821 | dev_queue_xmit(skb); |
822 | } | |
823 | ||
824 | return sent; | |
825 | } | |
826 | ||
49461622 | 827 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 828 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
571ecf67 JB |
829 | { |
830 | struct sta_info *sta = rx->sta; | |
a7767f95 | 831 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
571ecf67 JB |
832 | |
833 | if (!sta) | |
9ae54c84 | 834 | return RX_CONTINUE; |
571ecf67 JB |
835 | |
836 | /* Update last_rx only for IBSS packets which are for the current | |
837 | * BSSID to avoid keeping the current IBSS network alive in cases where | |
838 | * other STAs are using different BSSID. */ | |
05c914fe | 839 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
71364716 | 840 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
05c914fe | 841 | NL80211_IFTYPE_ADHOC); |
46900298 | 842 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
571ecf67 JB |
843 | sta->last_rx = jiffies; |
844 | } else | |
845 | if (!is_multicast_ether_addr(hdr->addr1) || | |
05c914fe | 846 | rx->sdata->vif.type == NL80211_IFTYPE_STATION) { |
571ecf67 JB |
847 | /* Update last_rx only for unicast frames in order to prevent |
848 | * the Probe Request frames (the only broadcast frames from a | |
849 | * STA in infrastructure mode) from keeping a connection alive. | |
33b64eb2 LCC |
850 | * Mesh beacons will update last_rx when if they are found to |
851 | * match the current local configuration when processed. | |
571ecf67 | 852 | */ |
15b7b062 KV |
853 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION && |
854 | ieee80211_is_beacon(hdr->frame_control)) { | |
855 | rx->sdata->u.mgd.last_beacon = jiffies; | |
856 | } else | |
857 | sta->last_rx = jiffies; | |
571ecf67 JB |
858 | } |
859 | ||
5cf121c3 | 860 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
9ae54c84 | 861 | return RX_CONTINUE; |
571ecf67 | 862 | |
3cf335d5 KV |
863 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
864 | ieee80211_sta_rx_notify(rx->sdata, hdr); | |
865 | ||
571ecf67 JB |
866 | sta->rx_fragments++; |
867 | sta->rx_bytes += rx->skb->len; | |
5cf121c3 | 868 | sta->last_signal = rx->status->signal; |
566bfe5a | 869 | sta->last_qual = rx->status->qual; |
5cf121c3 | 870 | sta->last_noise = rx->status->noise; |
571ecf67 | 871 | |
72eaa43a JB |
872 | /* |
873 | * Change STA power saving mode only at the end of a frame | |
874 | * exchange sequence. | |
875 | */ | |
3e122be0 | 876 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
05c914fe JB |
877 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
878 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { | |
72eaa43a JB |
879 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
880 | /* | |
881 | * Ignore doze->wake transitions that are | |
882 | * indicated by non-data frames, the standard | |
883 | * is unclear here, but for example going to | |
884 | * PS mode and then scanning would cause a | |
885 | * doze->wake transition for the probe request, | |
886 | * and that is clearly undesirable. | |
887 | */ | |
888 | if (ieee80211_is_data(hdr->frame_control) && | |
889 | !ieee80211_has_pm(hdr->frame_control)) | |
890 | rx->sent_ps_buffered += ap_sta_ps_end(sta); | |
891 | } else { | |
892 | if (ieee80211_has_pm(hdr->frame_control)) | |
893 | ap_sta_ps_start(sta); | |
894 | } | |
571ecf67 JB |
895 | } |
896 | ||
897 | /* Drop data::nullfunc frames silently, since they are used only to | |
898 | * control station power saving mode. */ | |
a7767f95 | 899 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
571ecf67 JB |
900 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
901 | /* Update counter and free packet here to avoid counting this | |
902 | * as a dropped packed. */ | |
903 | sta->rx_packets++; | |
904 | dev_kfree_skb(rx->skb); | |
9ae54c84 | 905 | return RX_QUEUED; |
571ecf67 JB |
906 | } |
907 | ||
9ae54c84 | 908 | return RX_CONTINUE; |
571ecf67 JB |
909 | } /* ieee80211_rx_h_sta_process */ |
910 | ||
571ecf67 JB |
911 | static inline struct ieee80211_fragment_entry * |
912 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, | |
913 | unsigned int frag, unsigned int seq, int rx_queue, | |
914 | struct sk_buff **skb) | |
915 | { | |
916 | struct ieee80211_fragment_entry *entry; | |
917 | int idx; | |
918 | ||
919 | idx = sdata->fragment_next; | |
920 | entry = &sdata->fragments[sdata->fragment_next++]; | |
921 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) | |
922 | sdata->fragment_next = 0; | |
923 | ||
924 | if (!skb_queue_empty(&entry->skb_list)) { | |
f4ea83dd | 925 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
571ecf67 JB |
926 | struct ieee80211_hdr *hdr = |
927 | (struct ieee80211_hdr *) entry->skb_list.next->data; | |
928 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " | |
929 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " | |
0c68ae26 | 930 | "addr1=%pM addr2=%pM\n", |
571ecf67 JB |
931 | sdata->dev->name, idx, |
932 | jiffies - entry->first_frag_time, entry->seq, | |
0c68ae26 | 933 | entry->last_frag, hdr->addr1, hdr->addr2); |
f4ea83dd | 934 | #endif |
571ecf67 JB |
935 | __skb_queue_purge(&entry->skb_list); |
936 | } | |
937 | ||
938 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ | |
939 | *skb = NULL; | |
940 | entry->first_frag_time = jiffies; | |
941 | entry->seq = seq; | |
942 | entry->rx_queue = rx_queue; | |
943 | entry->last_frag = frag; | |
944 | entry->ccmp = 0; | |
945 | entry->extra_len = 0; | |
946 | ||
947 | return entry; | |
948 | } | |
949 | ||
950 | static inline struct ieee80211_fragment_entry * | |
951 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, | |
b73d70ad | 952 | unsigned int frag, unsigned int seq, |
571ecf67 JB |
953 | int rx_queue, struct ieee80211_hdr *hdr) |
954 | { | |
955 | struct ieee80211_fragment_entry *entry; | |
956 | int i, idx; | |
957 | ||
958 | idx = sdata->fragment_next; | |
959 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { | |
960 | struct ieee80211_hdr *f_hdr; | |
571ecf67 JB |
961 | |
962 | idx--; | |
963 | if (idx < 0) | |
964 | idx = IEEE80211_FRAGMENT_MAX - 1; | |
965 | ||
966 | entry = &sdata->fragments[idx]; | |
967 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || | |
968 | entry->rx_queue != rx_queue || | |
969 | entry->last_frag + 1 != frag) | |
970 | continue; | |
971 | ||
b73d70ad | 972 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
571ecf67 | 973 | |
b73d70ad HH |
974 | /* |
975 | * Check ftype and addresses are equal, else check next fragment | |
976 | */ | |
977 | if (((hdr->frame_control ^ f_hdr->frame_control) & | |
978 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || | |
571ecf67 JB |
979 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
980 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) | |
981 | continue; | |
982 | ||
ab46623e | 983 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
571ecf67 JB |
984 | __skb_queue_purge(&entry->skb_list); |
985 | continue; | |
986 | } | |
987 | return entry; | |
988 | } | |
989 | ||
990 | return NULL; | |
991 | } | |
992 | ||
49461622 | 993 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 994 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
571ecf67 JB |
995 | { |
996 | struct ieee80211_hdr *hdr; | |
997 | u16 sc; | |
358c8d9d | 998 | __le16 fc; |
571ecf67 JB |
999 | unsigned int frag, seq; |
1000 | struct ieee80211_fragment_entry *entry; | |
1001 | struct sk_buff *skb; | |
1002 | ||
b73d70ad | 1003 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
358c8d9d | 1004 | fc = hdr->frame_control; |
571ecf67 JB |
1005 | sc = le16_to_cpu(hdr->seq_ctrl); |
1006 | frag = sc & IEEE80211_SCTL_FRAG; | |
1007 | ||
358c8d9d | 1008 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
571ecf67 JB |
1009 | (rx->skb)->len < 24 || |
1010 | is_multicast_ether_addr(hdr->addr1))) { | |
1011 | /* not fragmented */ | |
1012 | goto out; | |
1013 | } | |
1014 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); | |
1015 | ||
1016 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
1017 | ||
1018 | if (frag == 0) { | |
1019 | /* This is the first fragment of a new frame. */ | |
1020 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, | |
5cf121c3 | 1021 | rx->queue, &(rx->skb)); |
8f20fc24 | 1022 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
358c8d9d | 1023 | ieee80211_has_protected(fc)) { |
571ecf67 JB |
1024 | /* Store CCMP PN so that we can verify that the next |
1025 | * fragment has a sequential PN value. */ | |
1026 | entry->ccmp = 1; | |
1027 | memcpy(entry->last_pn, | |
5cf121c3 | 1028 | rx->key->u.ccmp.rx_pn[rx->queue], |
571ecf67 JB |
1029 | CCMP_PN_LEN); |
1030 | } | |
9ae54c84 | 1031 | return RX_QUEUED; |
571ecf67 JB |
1032 | } |
1033 | ||
1034 | /* This is a fragment for a frame that should already be pending in | |
1035 | * fragment cache. Add this fragment to the end of the pending entry. | |
1036 | */ | |
b73d70ad | 1037 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
571ecf67 JB |
1038 | if (!entry) { |
1039 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
e4c26add | 1040 | return RX_DROP_MONITOR; |
571ecf67 JB |
1041 | } |
1042 | ||
1043 | /* Verify that MPDUs within one MSDU have sequential PN values. | |
1044 | * (IEEE 802.11i, 8.3.3.4.5) */ | |
1045 | if (entry->ccmp) { | |
1046 | int i; | |
1047 | u8 pn[CCMP_PN_LEN], *rpn; | |
8f20fc24 | 1048 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
e4c26add | 1049 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1050 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
1051 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
1052 | pn[i]++; | |
1053 | if (pn[i]) | |
1054 | break; | |
1055 | } | |
5cf121c3 | 1056 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
f4ea83dd | 1057 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
e4c26add | 1058 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1059 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
1060 | } | |
1061 | ||
358c8d9d | 1062 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
571ecf67 JB |
1063 | __skb_queue_tail(&entry->skb_list, rx->skb); |
1064 | entry->last_frag = frag; | |
1065 | entry->extra_len += rx->skb->len; | |
358c8d9d | 1066 | if (ieee80211_has_morefrags(fc)) { |
571ecf67 | 1067 | rx->skb = NULL; |
9ae54c84 | 1068 | return RX_QUEUED; |
571ecf67 JB |
1069 | } |
1070 | ||
1071 | rx->skb = __skb_dequeue(&entry->skb_list); | |
1072 | if (skb_tailroom(rx->skb) < entry->extra_len) { | |
1073 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); | |
1074 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, | |
1075 | GFP_ATOMIC))) { | |
1076 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); | |
1077 | __skb_queue_purge(&entry->skb_list); | |
e4c26add | 1078 | return RX_DROP_UNUSABLE; |
571ecf67 JB |
1079 | } |
1080 | } | |
1081 | while ((skb = __skb_dequeue(&entry->skb_list))) { | |
1082 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); | |
1083 | dev_kfree_skb(skb); | |
1084 | } | |
1085 | ||
1086 | /* Complete frame has been reassembled - process it now */ | |
5cf121c3 | 1087 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
571ecf67 JB |
1088 | |
1089 | out: | |
1090 | if (rx->sta) | |
1091 | rx->sta->rx_packets++; | |
1092 | if (is_multicast_ether_addr(hdr->addr1)) | |
1093 | rx->local->dot11MulticastReceivedFrameCount++; | |
1094 | else | |
1095 | ieee80211_led_rx(rx->local); | |
9ae54c84 | 1096 | return RX_CONTINUE; |
571ecf67 JB |
1097 | } |
1098 | ||
49461622 | 1099 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1100 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
571ecf67 | 1101 | { |
98f0b0a3 | 1102 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
571ecf67 JB |
1103 | struct sk_buff *skb; |
1104 | int no_pending_pkts; | |
358c8d9d | 1105 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
571ecf67 | 1106 | |
358c8d9d | 1107 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
5cf121c3 | 1108 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
9ae54c84 | 1109 | return RX_CONTINUE; |
571ecf67 | 1110 | |
05c914fe JB |
1111 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
1112 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
e4c26add | 1113 | return RX_DROP_UNUSABLE; |
98f0b0a3 | 1114 | |
571ecf67 JB |
1115 | skb = skb_dequeue(&rx->sta->tx_filtered); |
1116 | if (!skb) { | |
1117 | skb = skb_dequeue(&rx->sta->ps_tx_buf); | |
1118 | if (skb) | |
1119 | rx->local->total_ps_buffered--; | |
1120 | } | |
1121 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && | |
1122 | skb_queue_empty(&rx->sta->ps_tx_buf); | |
1123 | ||
1124 | if (skb) { | |
1125 | struct ieee80211_hdr *hdr = | |
1126 | (struct ieee80211_hdr *) skb->data; | |
1127 | ||
4a9a66e9 JB |
1128 | /* |
1129 | * Tell TX path to send one frame even though the STA may | |
1130 | * still remain is PS mode after this frame exchange. | |
1131 | */ | |
07346f81 | 1132 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
571ecf67 JB |
1133 | |
1134 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
0c68ae26 JB |
1135 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
1136 | rx->sta->sta.addr, rx->sta->sta.aid, | |
571ecf67 JB |
1137 | skb_queue_len(&rx->sta->ps_tx_buf)); |
1138 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1139 | ||
1140 | /* Use MoreData flag to indicate whether there are more | |
1141 | * buffered frames for this STA */ | |
836341a7 | 1142 | if (no_pending_pkts) |
571ecf67 | 1143 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
836341a7 | 1144 | else |
571ecf67 JB |
1145 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1146 | ||
1147 | dev_queue_xmit(skb); | |
1148 | ||
004c872e JB |
1149 | if (no_pending_pkts) |
1150 | sta_info_clear_tim_bit(rx->sta); | |
571ecf67 | 1151 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
5cf121c3 | 1152 | } else if (!rx->sent_ps_buffered) { |
004c872e JB |
1153 | /* |
1154 | * FIXME: This can be the result of a race condition between | |
1155 | * us expiring a frame and the station polling for it. | |
1156 | * Should we send it a null-func frame indicating we | |
1157 | * have nothing buffered for it? | |
1158 | */ | |
0c68ae26 | 1159 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
f4ea83dd | 1160 | "though there are no buffered frames for it\n", |
0c68ae26 | 1161 | rx->dev->name, rx->sta->sta.addr); |
571ecf67 | 1162 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
571ecf67 JB |
1163 | } |
1164 | ||
9ae54c84 | 1165 | /* Free PS Poll skb here instead of returning RX_DROP that would |
571ecf67 JB |
1166 | * count as an dropped frame. */ |
1167 | dev_kfree_skb(rx->skb); | |
1168 | ||
9ae54c84 | 1169 | return RX_QUEUED; |
571ecf67 JB |
1170 | } |
1171 | ||
49461622 | 1172 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1173 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
6e0d114d | 1174 | { |
6e0d114d | 1175 | u8 *data = rx->skb->data; |
238f74a2 | 1176 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
6e0d114d | 1177 | |
238f74a2 | 1178 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
9ae54c84 | 1179 | return RX_CONTINUE; |
6e0d114d JB |
1180 | |
1181 | /* remove the qos control field, update frame type and meta-data */ | |
238f74a2 HH |
1182 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
1183 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); | |
1184 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); | |
6e0d114d | 1185 | /* change frame type to non QOS */ |
238f74a2 | 1186 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
6e0d114d | 1187 | |
9ae54c84 | 1188 | return RX_CONTINUE; |
6e0d114d JB |
1189 | } |
1190 | ||
76ee65bf | 1191 | static int |
5cf121c3 | 1192 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
571ecf67 | 1193 | { |
07346f81 | 1194 | if (unlikely(!rx->sta || |
f4ea83dd | 1195 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
76ee65bf | 1196 | return -EACCES; |
571ecf67 | 1197 | |
76ee65bf | 1198 | return 0; |
571ecf67 JB |
1199 | } |
1200 | ||
76ee65bf | 1201 | static int |
358c8d9d | 1202 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
571ecf67 | 1203 | { |
3017b80b | 1204 | /* |
7848ba7d JB |
1205 | * Pass through unencrypted frames if the hardware has |
1206 | * decrypted them already. | |
3017b80b | 1207 | */ |
5cf121c3 | 1208 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
76ee65bf | 1209 | return 0; |
571ecf67 JB |
1210 | |
1211 | /* Drop unencrypted frames if key is set. */ | |
358c8d9d HH |
1212 | if (unlikely(!ieee80211_has_protected(fc) && |
1213 | !ieee80211_is_nullfunc(fc) && | |
3cfcf6ac JM |
1214 | (!ieee80211_is_mgmt(fc) || |
1215 | (ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && | |
1216 | rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP))) && | |
1217 | (rx->key || rx->sdata->drop_unencrypted))) | |
1218 | return -EACCES; | |
1219 | /* BIP does not use Protected field, so need to check MMIE */ | |
1220 | if (unlikely(rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP) && | |
1221 | ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && | |
1222 | ieee80211_get_mmie_keyidx(rx->skb) < 0 && | |
b3fc9c6c | 1223 | (rx->key || rx->sdata->drop_unencrypted))) |
76ee65bf | 1224 | return -EACCES; |
b3fc9c6c | 1225 | |
76ee65bf | 1226 | return 0; |
571ecf67 JB |
1227 | } |
1228 | ||
76ee65bf | 1229 | static int |
5cf121c3 | 1230 | ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
571ecf67 JB |
1231 | { |
1232 | struct net_device *dev = rx->dev; | |
571ecf67 | 1233 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; |
b73d70ad | 1234 | u16 hdrlen, ethertype; |
571ecf67 JB |
1235 | u8 *payload; |
1236 | u8 dst[ETH_ALEN]; | |
c97c23e3 | 1237 | u8 src[ETH_ALEN] __aligned(2); |
76ee65bf | 1238 | struct sk_buff *skb = rx->skb; |
571ecf67 JB |
1239 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
1240 | ||
b73d70ad | 1241 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
76ee65bf | 1242 | return -1; |
571ecf67 | 1243 | |
b73d70ad | 1244 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1245 | |
1246 | /* convert IEEE 802.11 header + possible LLC headers into Ethernet | |
1247 | * header | |
1248 | * IEEE 802.11 address fields: | |
1249 | * ToDS FromDS Addr1 Addr2 Addr3 Addr4 | |
1250 | * 0 0 DA SA BSSID n/a | |
1251 | * 0 1 DA BSSID SA n/a | |
1252 | * 1 0 BSSID SA DA n/a | |
1253 | * 1 1 RA TA DA SA | |
1254 | */ | |
b73d70ad HH |
1255 | memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); |
1256 | memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); | |
571ecf67 | 1257 | |
b73d70ad HH |
1258 | switch (hdr->frame_control & |
1259 | cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { | |
c1b4aa3f | 1260 | case cpu_to_le16(IEEE80211_FCTL_TODS): |
05c914fe JB |
1261 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_AP && |
1262 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) | |
76ee65bf | 1263 | return -1; |
571ecf67 | 1264 | break; |
c1b4aa3f | 1265 | case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): |
05c914fe JB |
1266 | if (unlikely(sdata->vif.type != NL80211_IFTYPE_WDS && |
1267 | sdata->vif.type != NL80211_IFTYPE_MESH_POINT)) | |
76ee65bf | 1268 | return -1; |
79617dee Y |
1269 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
1270 | struct ieee80211s_hdr *meshdr = (struct ieee80211s_hdr *) | |
1271 | (skb->data + hdrlen); | |
1272 | hdrlen += ieee80211_get_mesh_hdrlen(meshdr); | |
1273 | if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { | |
1274 | memcpy(dst, meshdr->eaddr1, ETH_ALEN); | |
1275 | memcpy(src, meshdr->eaddr2, ETH_ALEN); | |
1276 | } | |
1277 | } | |
571ecf67 | 1278 | break; |
c1b4aa3f | 1279 | case cpu_to_le16(IEEE80211_FCTL_FROMDS): |
05c914fe | 1280 | if (sdata->vif.type != NL80211_IFTYPE_STATION || |
b3316157 JL |
1281 | (is_multicast_ether_addr(dst) && |
1282 | !compare_ether_addr(src, dev->dev_addr))) | |
76ee65bf | 1283 | return -1; |
571ecf67 | 1284 | break; |
c1b4aa3f | 1285 | case cpu_to_le16(0): |
05c914fe | 1286 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
76ee65bf | 1287 | return -1; |
571ecf67 JB |
1288 | break; |
1289 | } | |
1290 | ||
f4ea83dd | 1291 | if (unlikely(skb->len - hdrlen < 8)) |
76ee65bf | 1292 | return -1; |
571ecf67 | 1293 | |
76ee65bf | 1294 | payload = skb->data + hdrlen; |
571ecf67 JB |
1295 | ethertype = (payload[6] << 8) | payload[7]; |
1296 | ||
1297 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
1298 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || | |
1299 | compare_ether_addr(payload, bridge_tunnel_header) == 0)) { | |
1300 | /* remove RFC1042 or Bridge-Tunnel encapsulation and | |
1301 | * replace EtherType */ | |
1302 | skb_pull(skb, hdrlen + 6); | |
1303 | memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); | |
1304 | memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); | |
1305 | } else { | |
1306 | struct ethhdr *ehdr; | |
1307 | __be16 len; | |
ce3edf6d | 1308 | |
571ecf67 JB |
1309 | skb_pull(skb, hdrlen); |
1310 | len = htons(skb->len); | |
1311 | ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); | |
1312 | memcpy(ehdr->h_dest, dst, ETH_ALEN); | |
1313 | memcpy(ehdr->h_source, src, ETH_ALEN); | |
1314 | ehdr->h_proto = len; | |
1315 | } | |
76ee65bf RR |
1316 | return 0; |
1317 | } | |
571ecf67 | 1318 | |
ce3edf6d JB |
1319 | /* |
1320 | * requires that rx->skb is a frame with ethernet header | |
1321 | */ | |
358c8d9d | 1322 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
ce3edf6d | 1323 | { |
c97c23e3 | 1324 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
ce3edf6d JB |
1325 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
1326 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; | |
1327 | ||
1328 | /* | |
1329 | * Allow EAPOL frames to us/the PAE group address regardless | |
1330 | * of whether the frame was encrypted or not. | |
1331 | */ | |
1332 | if (ehdr->h_proto == htons(ETH_P_PAE) && | |
1333 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || | |
1334 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) | |
1335 | return true; | |
1336 | ||
1337 | if (ieee80211_802_1x_port_control(rx) || | |
358c8d9d | 1338 | ieee80211_drop_unencrypted(rx, fc)) |
ce3edf6d JB |
1339 | return false; |
1340 | ||
1341 | return true; | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * requires that rx->skb is a frame with ethernet header | |
1346 | */ | |
76ee65bf | 1347 | static void |
5cf121c3 | 1348 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1349 | { |
1350 | struct net_device *dev = rx->dev; | |
1351 | struct ieee80211_local *local = rx->local; | |
1352 | struct sk_buff *skb, *xmit_skb; | |
1353 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
ce3edf6d JB |
1354 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
1355 | struct sta_info *dsta; | |
571ecf67 | 1356 | |
76ee65bf RR |
1357 | skb = rx->skb; |
1358 | xmit_skb = NULL; | |
571ecf67 | 1359 | |
05c914fe JB |
1360 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
1361 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && | |
213cd118 | 1362 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
5cf121c3 | 1363 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
ce3edf6d JB |
1364 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
1365 | /* | |
1366 | * send multicast frames both to higher layers in | |
1367 | * local net stack and back to the wireless medium | |
1368 | */ | |
76ee65bf RR |
1369 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
1370 | if (!xmit_skb && net_ratelimit()) | |
571ecf67 JB |
1371 | printk(KERN_DEBUG "%s: failed to clone " |
1372 | "multicast frame\n", dev->name); | |
1373 | } else { | |
571ecf67 | 1374 | dsta = sta_info_get(local, skb->data); |
d0709a65 | 1375 | if (dsta && dsta->sdata->dev == dev) { |
ce3edf6d JB |
1376 | /* |
1377 | * The destination station is associated to | |
1378 | * this AP (in this VLAN), so send the frame | |
1379 | * directly to it and do not pass it to local | |
1380 | * net stack. | |
571ecf67 | 1381 | */ |
76ee65bf | 1382 | xmit_skb = skb; |
571ecf67 JB |
1383 | skb = NULL; |
1384 | } | |
571ecf67 JB |
1385 | } |
1386 | } | |
1387 | ||
1388 | if (skb) { | |
d1c3a37c JB |
1389 | int align __maybe_unused; |
1390 | ||
1391 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
1392 | /* | |
1393 | * 'align' will only take the values 0 or 2 here | |
1394 | * since all frames are required to be aligned | |
1395 | * to 2-byte boundaries when being passed to | |
1396 | * mac80211. That also explains the __skb_push() | |
1397 | * below. | |
1398 | */ | |
1399 | align = (unsigned long)skb->data & 4; | |
1400 | if (align) { | |
1401 | if (WARN_ON(skb_headroom(skb) < 3)) { | |
1402 | dev_kfree_skb(skb); | |
1403 | skb = NULL; | |
1404 | } else { | |
1405 | u8 *data = skb->data; | |
1406 | size_t len = skb->len; | |
1407 | u8 *new = __skb_push(skb, align); | |
1408 | memmove(new, data, len); | |
1409 | __skb_trim(skb, len); | |
1410 | } | |
1411 | } | |
1412 | #endif | |
1413 | ||
1414 | if (skb) { | |
1415 | /* deliver to local stack */ | |
1416 | skb->protocol = eth_type_trans(skb, dev); | |
1417 | memset(skb->cb, 0, sizeof(skb->cb)); | |
1418 | netif_rx(skb); | |
1419 | } | |
571ecf67 JB |
1420 | } |
1421 | ||
76ee65bf | 1422 | if (xmit_skb) { |
571ecf67 | 1423 | /* send to wireless media */ |
f831e909 | 1424 | xmit_skb->protocol = htons(ETH_P_802_3); |
ce3edf6d JB |
1425 | skb_reset_network_header(xmit_skb); |
1426 | skb_reset_mac_header(xmit_skb); | |
76ee65bf | 1427 | dev_queue_xmit(xmit_skb); |
571ecf67 | 1428 | } |
76ee65bf RR |
1429 | } |
1430 | ||
49461622 | 1431 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1432 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
fd4c7f2f RR |
1433 | { |
1434 | struct net_device *dev = rx->dev; | |
1435 | struct ieee80211_local *local = rx->local; | |
358c8d9d | 1436 | u16 ethertype; |
fd4c7f2f RR |
1437 | u8 *payload; |
1438 | struct sk_buff *skb = rx->skb, *frame = NULL; | |
358c8d9d HH |
1439 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1440 | __le16 fc = hdr->frame_control; | |
fd4c7f2f RR |
1441 | const struct ethhdr *eth; |
1442 | int remaining, err; | |
1443 | u8 dst[ETH_ALEN]; | |
1444 | u8 src[ETH_ALEN]; | |
fd4c7f2f | 1445 | |
358c8d9d | 1446 | if (unlikely(!ieee80211_is_data(fc))) |
9ae54c84 | 1447 | return RX_CONTINUE; |
fd4c7f2f | 1448 | |
358c8d9d | 1449 | if (unlikely(!ieee80211_is_data_present(fc))) |
e4c26add | 1450 | return RX_DROP_MONITOR; |
fd4c7f2f | 1451 | |
5cf121c3 | 1452 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
9ae54c84 | 1453 | return RX_CONTINUE; |
fd4c7f2f RR |
1454 | |
1455 | err = ieee80211_data_to_8023(rx); | |
1456 | if (unlikely(err)) | |
e4c26add | 1457 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1458 | |
1459 | skb->dev = dev; | |
1460 | ||
1461 | dev->stats.rx_packets++; | |
1462 | dev->stats.rx_bytes += skb->len; | |
1463 | ||
1464 | /* skip the wrapping header */ | |
1465 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); | |
1466 | if (!eth) | |
e4c26add | 1467 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1468 | |
1469 | while (skb != frame) { | |
1470 | u8 padding; | |
1471 | __be16 len = eth->h_proto; | |
1472 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); | |
1473 | ||
1474 | remaining = skb->len; | |
1475 | memcpy(dst, eth->h_dest, ETH_ALEN); | |
1476 | memcpy(src, eth->h_source, ETH_ALEN); | |
1477 | ||
1478 | padding = ((4 - subframe_len) & 0x3); | |
1479 | /* the last MSDU has no padding */ | |
f4ea83dd | 1480 | if (subframe_len > remaining) |
e4c26add | 1481 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1482 | |
1483 | skb_pull(skb, sizeof(struct ethhdr)); | |
1484 | /* if last subframe reuse skb */ | |
1485 | if (remaining <= subframe_len + padding) | |
1486 | frame = skb; | |
1487 | else { | |
d1c3a37c JB |
1488 | /* |
1489 | * Allocate and reserve two bytes more for payload | |
1490 | * alignment since sizeof(struct ethhdr) is 14. | |
1491 | */ | |
1492 | frame = dev_alloc_skb( | |
1493 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1494 | subframe_len + 2); | |
fd4c7f2f RR |
1495 | |
1496 | if (frame == NULL) | |
e4c26add | 1497 | return RX_DROP_UNUSABLE; |
fd4c7f2f | 1498 | |
d1c3a37c JB |
1499 | skb_reserve(frame, |
1500 | ALIGN(local->hw.extra_tx_headroom, 4) + | |
1501 | sizeof(struct ethhdr) + 2); | |
fd4c7f2f RR |
1502 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
1503 | ntohs(len)); | |
1504 | ||
1505 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + | |
1506 | padding); | |
1507 | if (!eth) { | |
fd4c7f2f | 1508 | dev_kfree_skb(frame); |
e4c26add | 1509 | return RX_DROP_UNUSABLE; |
fd4c7f2f RR |
1510 | } |
1511 | } | |
1512 | ||
ce3edf6d | 1513 | skb_reset_network_header(frame); |
fd4c7f2f RR |
1514 | frame->dev = dev; |
1515 | frame->priority = skb->priority; | |
1516 | rx->skb = frame; | |
1517 | ||
fd4c7f2f RR |
1518 | payload = frame->data; |
1519 | ethertype = (payload[6] << 8) | payload[7]; | |
1520 | ||
1521 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && | |
ce3edf6d JB |
1522 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
1523 | compare_ether_addr(payload, | |
1524 | bridge_tunnel_header) == 0)) { | |
fd4c7f2f RR |
1525 | /* remove RFC1042 or Bridge-Tunnel |
1526 | * encapsulation and replace EtherType */ | |
1527 | skb_pull(frame, 6); | |
1528 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); | |
1529 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1530 | } else { | |
ce3edf6d JB |
1531 | memcpy(skb_push(frame, sizeof(__be16)), |
1532 | &len, sizeof(__be16)); | |
fd4c7f2f RR |
1533 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
1534 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); | |
1535 | } | |
1536 | ||
358c8d9d | 1537 | if (!ieee80211_frame_allowed(rx, fc)) { |
ce3edf6d | 1538 | if (skb == frame) /* last frame */ |
e4c26add | 1539 | return RX_DROP_UNUSABLE; |
ce3edf6d JB |
1540 | dev_kfree_skb(frame); |
1541 | continue; | |
1542 | } | |
fd4c7f2f RR |
1543 | |
1544 | ieee80211_deliver_skb(rx); | |
1545 | } | |
1546 | ||
9ae54c84 | 1547 | return RX_QUEUED; |
fd4c7f2f RR |
1548 | } |
1549 | ||
bf94e17b | 1550 | #ifdef CONFIG_MAC80211_MESH |
b0dee578 | 1551 | static ieee80211_rx_result |
e32f85f7 LCC |
1552 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
1553 | { | |
1554 | struct ieee80211_hdr *hdr; | |
1555 | struct ieee80211s_hdr *mesh_hdr; | |
1556 | unsigned int hdrlen; | |
1557 | struct sk_buff *skb = rx->skb, *fwd_skb; | |
1558 | ||
1559 | hdr = (struct ieee80211_hdr *) skb->data; | |
1560 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
1561 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); | |
1562 | ||
1563 | if (!ieee80211_is_data(hdr->frame_control)) | |
1564 | return RX_CONTINUE; | |
1565 | ||
1566 | if (!mesh_hdr->ttl) | |
1567 | /* illegal frame */ | |
1568 | return RX_DROP_MONITOR; | |
1569 | ||
79617dee Y |
1570 | if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6){ |
1571 | struct ieee80211_sub_if_data *sdata; | |
1572 | struct mesh_path *mppath; | |
1573 | ||
1574 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1575 | rcu_read_lock(); | |
1576 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); | |
1577 | if (!mppath) { | |
1578 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); | |
1579 | } else { | |
1580 | spin_lock_bh(&mppath->state_lock); | |
1581 | mppath->exp_time = jiffies; | |
1582 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) | |
1583 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); | |
1584 | spin_unlock_bh(&mppath->state_lock); | |
1585 | } | |
1586 | rcu_read_unlock(); | |
1587 | } | |
1588 | ||
e32f85f7 LCC |
1589 | if (compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
1590 | return RX_CONTINUE; | |
1591 | ||
1592 | mesh_hdr->ttl--; | |
1593 | ||
1594 | if (rx->flags & IEEE80211_RX_RA_MATCH) { | |
1595 | if (!mesh_hdr->ttl) | |
472dbc45 | 1596 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
e32f85f7 LCC |
1597 | dropped_frames_ttl); |
1598 | else { | |
1599 | struct ieee80211_hdr *fwd_hdr; | |
1600 | fwd_skb = skb_copy(skb, GFP_ATOMIC); | |
1601 | ||
1602 | if (!fwd_skb && net_ratelimit()) | |
1603 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", | |
1604 | rx->dev->name); | |
1605 | ||
1606 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; | |
1607 | /* | |
1608 | * Save TA to addr1 to send TA a path error if a | |
1609 | * suitable next hop is not found | |
1610 | */ | |
1611 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, ETH_ALEN); | |
1612 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); | |
1613 | fwd_skb->dev = rx->local->mdev; | |
1614 | fwd_skb->iif = rx->dev->ifindex; | |
1615 | dev_queue_xmit(fwd_skb); | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | if (is_multicast_ether_addr(hdr->addr3) || | |
1620 | rx->dev->flags & IFF_PROMISC) | |
1621 | return RX_CONTINUE; | |
1622 | else | |
1623 | return RX_DROP_MONITOR; | |
1624 | } | |
bf94e17b | 1625 | #endif |
e32f85f7 | 1626 | |
49461622 | 1627 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1628 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
76ee65bf RR |
1629 | { |
1630 | struct net_device *dev = rx->dev; | |
358c8d9d HH |
1631 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
1632 | __le16 fc = hdr->frame_control; | |
ce3edf6d | 1633 | int err; |
76ee65bf | 1634 | |
358c8d9d | 1635 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
9ae54c84 | 1636 | return RX_CONTINUE; |
76ee65bf | 1637 | |
358c8d9d | 1638 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
e4c26add | 1639 | return RX_DROP_MONITOR; |
76ee65bf | 1640 | |
76ee65bf RR |
1641 | err = ieee80211_data_to_8023(rx); |
1642 | if (unlikely(err)) | |
e4c26add | 1643 | return RX_DROP_UNUSABLE; |
76ee65bf | 1644 | |
358c8d9d | 1645 | if (!ieee80211_frame_allowed(rx, fc)) |
e4c26add | 1646 | return RX_DROP_MONITOR; |
ce3edf6d | 1647 | |
76ee65bf RR |
1648 | rx->skb->dev = dev; |
1649 | ||
1650 | dev->stats.rx_packets++; | |
1651 | dev->stats.rx_bytes += rx->skb->len; | |
1652 | ||
1653 | ieee80211_deliver_skb(rx); | |
571ecf67 | 1654 | |
9ae54c84 | 1655 | return RX_QUEUED; |
571ecf67 JB |
1656 | } |
1657 | ||
49461622 | 1658 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1659 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
71364716 RR |
1660 | { |
1661 | struct ieee80211_local *local = rx->local; | |
1662 | struct ieee80211_hw *hw = &local->hw; | |
1663 | struct sk_buff *skb = rx->skb; | |
a7767f95 | 1664 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
71364716 RR |
1665 | struct tid_ampdu_rx *tid_agg_rx; |
1666 | u16 start_seq_num; | |
1667 | u16 tid; | |
1668 | ||
a7767f95 | 1669 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
9ae54c84 | 1670 | return RX_CONTINUE; |
71364716 | 1671 | |
a7767f95 | 1672 | if (ieee80211_is_back_req(bar->frame_control)) { |
71364716 | 1673 | if (!rx->sta) |
9ae54c84 | 1674 | return RX_CONTINUE; |
71364716 | 1675 | tid = le16_to_cpu(bar->control) >> 12; |
cee24a3e RR |
1676 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
1677 | != HT_AGG_STATE_OPERATIONAL) | |
9ae54c84 | 1678 | return RX_CONTINUE; |
cee24a3e | 1679 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
71364716 RR |
1680 | |
1681 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; | |
1682 | ||
1683 | /* reset session timer */ | |
20ad19d0 JB |
1684 | if (tid_agg_rx->timeout) |
1685 | mod_timer(&tid_agg_rx->session_timer, | |
1686 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
71364716 RR |
1687 | |
1688 | /* manage reordering buffer according to requested */ | |
1689 | /* sequence number */ | |
1690 | rcu_read_lock(); | |
1691 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, | |
1692 | start_seq_num, 1); | |
1693 | rcu_read_unlock(); | |
e4c26add | 1694 | return RX_DROP_UNUSABLE; |
71364716 RR |
1695 | } |
1696 | ||
9ae54c84 | 1697 | return RX_CONTINUE; |
71364716 RR |
1698 | } |
1699 | ||
f4f727a6 JM |
1700 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
1701 | struct ieee80211_mgmt *mgmt, | |
1702 | size_t len) | |
fea14732 JM |
1703 | { |
1704 | struct ieee80211_local *local = sdata->local; | |
1705 | struct sk_buff *skb; | |
1706 | struct ieee80211_mgmt *resp; | |
1707 | ||
1708 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { | |
1709 | /* Not to own unicast address */ | |
1710 | return; | |
1711 | } | |
1712 | ||
46900298 JB |
1713 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
1714 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { | |
fea14732 JM |
1715 | /* Not from the current AP. */ |
1716 | return; | |
1717 | } | |
1718 | ||
46900298 | 1719 | if (sdata->u.mgd.state == IEEE80211_STA_MLME_ASSOCIATE) { |
fea14732 JM |
1720 | /* Association in progress; ignore SA Query */ |
1721 | return; | |
1722 | } | |
1723 | ||
1724 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { | |
1725 | /* Too short SA Query request frame */ | |
1726 | return; | |
1727 | } | |
1728 | ||
1729 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); | |
1730 | if (skb == NULL) | |
1731 | return; | |
1732 | ||
1733 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
1734 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
1735 | memset(resp, 0, 24); | |
1736 | memcpy(resp->da, mgmt->sa, ETH_ALEN); | |
1737 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); | |
46900298 | 1738 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
fea14732 JM |
1739 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
1740 | IEEE80211_STYPE_ACTION); | |
1741 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); | |
1742 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; | |
1743 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; | |
1744 | memcpy(resp->u.action.u.sa_query.trans_id, | |
1745 | mgmt->u.action.u.sa_query.trans_id, | |
1746 | WLAN_SA_QUERY_TR_ID_LEN); | |
1747 | ||
1748 | ieee80211_tx_skb(sdata, skb, 1); | |
1749 | } | |
1750 | ||
de1ede7a JB |
1751 | static ieee80211_rx_result debug_noinline |
1752 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) | |
1753 | { | |
1754 | struct ieee80211_local *local = rx->local; | |
1755 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); | |
1756 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; | |
c481ec97 | 1757 | struct ieee80211_bss *bss; |
de1ede7a JB |
1758 | int len = rx->skb->len; |
1759 | ||
1760 | if (!ieee80211_is_action(mgmt->frame_control)) | |
1761 | return RX_CONTINUE; | |
1762 | ||
1763 | if (!rx->sta) | |
1764 | return RX_DROP_MONITOR; | |
1765 | ||
1766 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) | |
1767 | return RX_DROP_MONITOR; | |
1768 | ||
97ebe12a JM |
1769 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1770 | return RX_DROP_MONITOR; | |
1771 | ||
de1ede7a JB |
1772 | /* all categories we currently handle have action_code */ |
1773 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
1774 | return RX_DROP_MONITOR; | |
1775 | ||
de1ede7a JB |
1776 | switch (mgmt->u.action.category) { |
1777 | case WLAN_CATEGORY_BACK: | |
8abd3f9b JB |
1778 | /* |
1779 | * The aggregation code is not prepared to handle | |
1780 | * anything but STA/AP due to the BSSID handling; | |
1781 | * IBSS could work in the code but isn't supported | |
1782 | * by drivers or the standard. | |
1783 | */ | |
1784 | if (sdata->vif.type != NL80211_IFTYPE_STATION && | |
1785 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && | |
1786 | sdata->vif.type != NL80211_IFTYPE_AP) | |
1787 | return RX_DROP_MONITOR; | |
1788 | ||
de1ede7a JB |
1789 | switch (mgmt->u.action.u.addba_req.action_code) { |
1790 | case WLAN_ACTION_ADDBA_REQ: | |
1791 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1792 | sizeof(mgmt->u.action.u.addba_req))) | |
1793 | return RX_DROP_MONITOR; | |
1794 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); | |
1795 | break; | |
1796 | case WLAN_ACTION_ADDBA_RESP: | |
1797 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1798 | sizeof(mgmt->u.action.u.addba_resp))) | |
1799 | return RX_DROP_MONITOR; | |
1800 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); | |
1801 | break; | |
1802 | case WLAN_ACTION_DELBA: | |
1803 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1804 | sizeof(mgmt->u.action.u.delba))) | |
1805 | return RX_DROP_MONITOR; | |
1806 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); | |
1807 | break; | |
1808 | } | |
39192c0b JB |
1809 | break; |
1810 | case WLAN_CATEGORY_SPECTRUM_MGMT: | |
1811 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) | |
1812 | return RX_DROP_MONITOR; | |
46900298 JB |
1813 | |
1814 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1815 | return RX_DROP_MONITOR; | |
1816 | ||
39192c0b JB |
1817 | switch (mgmt->u.action.u.measurement.action_code) { |
1818 | case WLAN_ACTION_SPCT_MSR_REQ: | |
1819 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1820 | sizeof(mgmt->u.action.u.measurement))) | |
1821 | return RX_DROP_MONITOR; | |
1822 | ieee80211_process_measurement_req(sdata, mgmt, len); | |
1823 | break; | |
c481ec97 S |
1824 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
1825 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1826 | sizeof(mgmt->u.action.u.chan_switch))) | |
1827 | return RX_DROP_MONITOR; | |
1828 | ||
46900298 | 1829 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
c481ec97 S |
1830 | return RX_DROP_MONITOR; |
1831 | ||
46900298 | 1832 | bss = ieee80211_rx_bss_get(local, sdata->u.mgd.bssid, |
c481ec97 | 1833 | local->hw.conf.channel->center_freq, |
46900298 JB |
1834 | sdata->u.mgd.ssid, |
1835 | sdata->u.mgd.ssid_len); | |
c481ec97 S |
1836 | if (!bss) |
1837 | return RX_DROP_MONITOR; | |
1838 | ||
1839 | ieee80211_process_chanswitch(sdata, | |
1840 | &mgmt->u.action.u.chan_switch.sw_elem, bss); | |
1841 | ieee80211_rx_bss_put(local, bss); | |
1842 | break; | |
39192c0b JB |
1843 | } |
1844 | break; | |
fea14732 JM |
1845 | case WLAN_CATEGORY_SA_QUERY: |
1846 | if (len < (IEEE80211_MIN_ACTION_SIZE + | |
1847 | sizeof(mgmt->u.action.u.sa_query))) | |
1848 | return RX_DROP_MONITOR; | |
1849 | switch (mgmt->u.action.u.sa_query.action) { | |
1850 | case WLAN_ACTION_SA_QUERY_REQUEST: | |
1851 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
1852 | return RX_DROP_MONITOR; | |
1853 | ieee80211_process_sa_query_req(sdata, mgmt, len); | |
1854 | break; | |
1855 | case WLAN_ACTION_SA_QUERY_RESPONSE: | |
1856 | /* | |
1857 | * SA Query response is currently only used in AP mode | |
1858 | * and it is processed in user space. | |
1859 | */ | |
1860 | return RX_CONTINUE; | |
1861 | } | |
1862 | break; | |
39192c0b JB |
1863 | default: |
1864 | return RX_CONTINUE; | |
de1ede7a JB |
1865 | } |
1866 | ||
39192c0b JB |
1867 | rx->sta->rx_packets++; |
1868 | dev_kfree_skb(rx->skb); | |
1869 | return RX_QUEUED; | |
de1ede7a JB |
1870 | } |
1871 | ||
49461622 | 1872 | static ieee80211_rx_result debug_noinline |
5cf121c3 | 1873 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
571ecf67 | 1874 | { |
759ef3eb | 1875 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
97ebe12a | 1876 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
571ecf67 | 1877 | |
5cf121c3 | 1878 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 1879 | return RX_DROP_MONITOR; |
571ecf67 | 1880 | |
97ebe12a JM |
1881 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
1882 | return RX_DROP_MONITOR; | |
1883 | ||
472dbc45 JB |
1884 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
1885 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb, rx->status); | |
1886 | ||
3832c287 | 1887 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
7986cf95 | 1888 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb, rx->status); |
f9d540ee | 1889 | |
7986cf95 | 1890 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
46900298 | 1891 | return ieee80211_sta_rx_mgmt(sdata, rx->skb, rx->status); |
46900298 | 1892 | |
7986cf95 | 1893 | return RX_DROP_MONITOR; |
571ecf67 JB |
1894 | } |
1895 | ||
571ecf67 JB |
1896 | static void ieee80211_rx_michael_mic_report(struct net_device *dev, |
1897 | struct ieee80211_hdr *hdr, | |
5cf121c3 | 1898 | struct ieee80211_rx_data *rx) |
571ecf67 | 1899 | { |
a7767f95 HH |
1900 | int keyidx; |
1901 | unsigned int hdrlen; | |
571ecf67 | 1902 | |
a7767f95 | 1903 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
571ecf67 JB |
1904 | if (rx->skb->len >= hdrlen + 4) |
1905 | keyidx = rx->skb->data[hdrlen + 3] >> 6; | |
1906 | else | |
1907 | keyidx = -1; | |
1908 | ||
8944b79f | 1909 | if (!rx->sta) { |
aa0daf0e JB |
1910 | /* |
1911 | * Some hardware seem to generate incorrect Michael MIC | |
1912 | * reports; ignore them to avoid triggering countermeasures. | |
1913 | */ | |
571ecf67 JB |
1914 | goto ignore; |
1915 | } | |
1916 | ||
a7767f95 | 1917 | if (!ieee80211_has_protected(hdr->frame_control)) |
571ecf67 | 1918 | goto ignore; |
571ecf67 | 1919 | |
05c914fe | 1920 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
aa0daf0e JB |
1921 | /* |
1922 | * APs with pairwise keys should never receive Michael MIC | |
1923 | * errors for non-zero keyidx because these are reserved for | |
1924 | * group keys and only the AP is sending real multicast | |
1925 | * frames in the BSS. | |
1926 | */ | |
eb063c17 | 1927 | goto ignore; |
571ecf67 JB |
1928 | } |
1929 | ||
a7767f95 HH |
1930 | if (!ieee80211_is_data(hdr->frame_control) && |
1931 | !ieee80211_is_auth(hdr->frame_control)) | |
571ecf67 | 1932 | goto ignore; |
571ecf67 | 1933 | |
f698d856 | 1934 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr); |
571ecf67 JB |
1935 | ignore: |
1936 | dev_kfree_skb(rx->skb); | |
1937 | rx->skb = NULL; | |
1938 | } | |
1939 | ||
5cf121c3 JB |
1940 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
1941 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) | |
3d30d949 MW |
1942 | { |
1943 | struct ieee80211_sub_if_data *sdata; | |
1944 | struct ieee80211_local *local = rx->local; | |
1945 | struct ieee80211_rtap_hdr { | |
1946 | struct ieee80211_radiotap_header hdr; | |
1947 | u8 flags; | |
1948 | u8 rate; | |
1949 | __le16 chan_freq; | |
1950 | __le16 chan_flags; | |
1951 | } __attribute__ ((packed)) *rthdr; | |
1952 | struct sk_buff *skb = rx->skb, *skb2; | |
1953 | struct net_device *prev_dev = NULL; | |
5cf121c3 | 1954 | struct ieee80211_rx_status *status = rx->status; |
3d30d949 | 1955 | |
5cf121c3 | 1956 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
3d30d949 MW |
1957 | goto out_free_skb; |
1958 | ||
1959 | if (skb_headroom(skb) < sizeof(*rthdr) && | |
1960 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) | |
1961 | goto out_free_skb; | |
1962 | ||
1963 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); | |
1964 | memset(rthdr, 0, sizeof(*rthdr)); | |
1965 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); | |
1966 | rthdr->hdr.it_present = | |
1967 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | | |
1968 | (1 << IEEE80211_RADIOTAP_RATE) | | |
1969 | (1 << IEEE80211_RADIOTAP_CHANNEL)); | |
1970 | ||
5cf121c3 | 1971 | rthdr->rate = rx->rate->bitrate / 5; |
3d30d949 MW |
1972 | rthdr->chan_freq = cpu_to_le16(status->freq); |
1973 | ||
1974 | if (status->band == IEEE80211_BAND_5GHZ) | |
1975 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | | |
1976 | IEEE80211_CHAN_5GHZ); | |
1977 | else | |
1978 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | | |
1979 | IEEE80211_CHAN_2GHZ); | |
1980 | ||
1981 | skb_set_mac_header(skb, 0); | |
1982 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1983 | skb->pkt_type = PACKET_OTHERHOST; | |
1984 | skb->protocol = htons(ETH_P_802_2); | |
1985 | ||
1986 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
1987 | if (!netif_running(sdata->dev)) | |
1988 | continue; | |
1989 | ||
05c914fe | 1990 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
3d30d949 MW |
1991 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
1992 | continue; | |
1993 | ||
1994 | if (prev_dev) { | |
1995 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1996 | if (skb2) { | |
1997 | skb2->dev = prev_dev; | |
1998 | netif_rx(skb2); | |
1999 | } | |
2000 | } | |
2001 | ||
2002 | prev_dev = sdata->dev; | |
2003 | sdata->dev->stats.rx_packets++; | |
2004 | sdata->dev->stats.rx_bytes += skb->len; | |
2005 | } | |
2006 | ||
2007 | if (prev_dev) { | |
2008 | skb->dev = prev_dev; | |
2009 | netif_rx(skb); | |
2010 | skb = NULL; | |
2011 | } else | |
2012 | goto out_free_skb; | |
2013 | ||
5cf121c3 | 2014 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
3d30d949 MW |
2015 | return; |
2016 | ||
2017 | out_free_skb: | |
2018 | dev_kfree_skb(skb); | |
2019 | } | |
2020 | ||
571ecf67 | 2021 | |
8944b79f | 2022 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
5cf121c3 | 2023 | struct ieee80211_rx_data *rx, |
8944b79f | 2024 | struct sk_buff *skb) |
58905290 | 2025 | { |
58905290 JB |
2026 | ieee80211_rx_result res = RX_DROP_MONITOR; |
2027 | ||
8944b79f JB |
2028 | rx->skb = skb; |
2029 | rx->sdata = sdata; | |
2030 | rx->dev = sdata->dev; | |
2031 | ||
e32f85f7 LCC |
2032 | #define CALL_RXH(rxh) \ |
2033 | do { \ | |
2034 | res = rxh(rx); \ | |
2035 | if (res != RX_CONTINUE) \ | |
2036 | goto rxh_done; \ | |
2037 | } while (0); | |
49461622 JB |
2038 | |
2039 | CALL_RXH(ieee80211_rx_h_passive_scan) | |
2040 | CALL_RXH(ieee80211_rx_h_check) | |
2041 | CALL_RXH(ieee80211_rx_h_decrypt) | |
572e0012 | 2042 | CALL_RXH(ieee80211_rx_h_check_more_data) |
49461622 JB |
2043 | CALL_RXH(ieee80211_rx_h_sta_process) |
2044 | CALL_RXH(ieee80211_rx_h_defragment) | |
2045 | CALL_RXH(ieee80211_rx_h_ps_poll) | |
2046 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) | |
2047 | /* must be after MMIC verify so header is counted in MPDU mic */ | |
2048 | CALL_RXH(ieee80211_rx_h_remove_qos_control) | |
2049 | CALL_RXH(ieee80211_rx_h_amsdu) | |
bf94e17b | 2050 | #ifdef CONFIG_MAC80211_MESH |
e32f85f7 LCC |
2051 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
2052 | CALL_RXH(ieee80211_rx_h_mesh_fwding); | |
bf94e17b | 2053 | #endif |
49461622 JB |
2054 | CALL_RXH(ieee80211_rx_h_data) |
2055 | CALL_RXH(ieee80211_rx_h_ctrl) | |
de1ede7a | 2056 | CALL_RXH(ieee80211_rx_h_action) |
49461622 JB |
2057 | CALL_RXH(ieee80211_rx_h_mgmt) |
2058 | ||
2059 | #undef CALL_RXH | |
2060 | ||
2061 | rxh_done: | |
58905290 JB |
2062 | switch (res) { |
2063 | case RX_DROP_MONITOR: | |
49461622 JB |
2064 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2065 | if (rx->sta) | |
2066 | rx->sta->rx_dropped++; | |
2067 | /* fall through */ | |
2068 | case RX_CONTINUE: | |
3d30d949 MW |
2069 | ieee80211_rx_cooked_monitor(rx); |
2070 | break; | |
58905290 | 2071 | case RX_DROP_UNUSABLE: |
49461622 JB |
2072 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
2073 | if (rx->sta) | |
2074 | rx->sta->rx_dropped++; | |
58905290 JB |
2075 | dev_kfree_skb(rx->skb); |
2076 | break; | |
49461622 JB |
2077 | case RX_QUEUED: |
2078 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); | |
2079 | break; | |
58905290 JB |
2080 | } |
2081 | } | |
2082 | ||
571ecf67 JB |
2083 | /* main receive path */ |
2084 | ||
23a24def | 2085 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
7ab17c45 | 2086 | struct ieee80211_rx_data *rx, |
23a24def JB |
2087 | struct ieee80211_hdr *hdr) |
2088 | { | |
7ab17c45 | 2089 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
23a24def JB |
2090 | int multicast = is_multicast_ether_addr(hdr->addr1); |
2091 | ||
51fb61e7 | 2092 | switch (sdata->vif.type) { |
05c914fe | 2093 | case NL80211_IFTYPE_STATION: |
23a24def JB |
2094 | if (!bssid) |
2095 | return 0; | |
46900298 | 2096 | if (!ieee80211_bssid_match(bssid, sdata->u.mgd.bssid)) { |
5cf121c3 | 2097 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2098 | return 0; |
5cf121c3 | 2099 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2100 | } else if (!multicast && |
2101 | compare_ether_addr(sdata->dev->dev_addr, | |
2102 | hdr->addr1) != 0) { | |
4150c572 | 2103 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2104 | return 0; |
5cf121c3 | 2105 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2106 | } |
2107 | break; | |
05c914fe | 2108 | case NL80211_IFTYPE_ADHOC: |
23a24def JB |
2109 | if (!bssid) |
2110 | return 0; | |
a7767f95 | 2111 | if (ieee80211_is_beacon(hdr->frame_control)) { |
9d9bf77d | 2112 | return 1; |
87291c02 | 2113 | } |
46900298 | 2114 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
5cf121c3 | 2115 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2116 | return 0; |
5cf121c3 | 2117 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def JB |
2118 | } else if (!multicast && |
2119 | compare_ether_addr(sdata->dev->dev_addr, | |
2120 | hdr->addr1) != 0) { | |
4150c572 | 2121 | if (!(sdata->dev->flags & IFF_PROMISC)) |
23a24def | 2122 | return 0; |
5cf121c3 | 2123 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
0fb8ca45 JM |
2124 | } else if (!rx->sta) { |
2125 | int rate_idx; | |
2126 | if (rx->status->flag & RX_FLAG_HT) | |
2127 | rate_idx = 0; /* TODO: HT rates */ | |
2128 | else | |
2129 | rate_idx = rx->status->rate_idx; | |
ab1f5c0b | 2130 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
0fb8ca45 JM |
2131 | BIT(rate_idx)); |
2132 | } | |
23a24def | 2133 | break; |
05c914fe | 2134 | case NL80211_IFTYPE_MESH_POINT: |
6032f934 JB |
2135 | if (!multicast && |
2136 | compare_ether_addr(sdata->dev->dev_addr, | |
2137 | hdr->addr1) != 0) { | |
2138 | if (!(sdata->dev->flags & IFF_PROMISC)) | |
2139 | return 0; | |
2140 | ||
5cf121c3 | 2141 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
6032f934 JB |
2142 | } |
2143 | break; | |
05c914fe JB |
2144 | case NL80211_IFTYPE_AP_VLAN: |
2145 | case NL80211_IFTYPE_AP: | |
23a24def JB |
2146 | if (!bssid) { |
2147 | if (compare_ether_addr(sdata->dev->dev_addr, | |
2148 | hdr->addr1)) | |
2149 | return 0; | |
2150 | } else if (!ieee80211_bssid_match(bssid, | |
2151 | sdata->dev->dev_addr)) { | |
5cf121c3 | 2152 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
23a24def | 2153 | return 0; |
5cf121c3 | 2154 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
23a24def | 2155 | } |
23a24def | 2156 | break; |
05c914fe | 2157 | case NL80211_IFTYPE_WDS: |
a7767f95 | 2158 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
23a24def JB |
2159 | return 0; |
2160 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) | |
2161 | return 0; | |
2162 | break; | |
05c914fe | 2163 | case NL80211_IFTYPE_MONITOR: |
fb1c1cd6 JB |
2164 | /* take everything */ |
2165 | break; | |
05c914fe JB |
2166 | case NL80211_IFTYPE_UNSPECIFIED: |
2167 | case __NL80211_IFTYPE_AFTER_LAST: | |
fb1c1cd6 JB |
2168 | /* should never get here */ |
2169 | WARN_ON(1); | |
2170 | break; | |
23a24def JB |
2171 | } |
2172 | ||
2173 | return 1; | |
2174 | } | |
2175 | ||
571ecf67 | 2176 | /* |
6368e4b1 RR |
2177 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
2178 | * be called with rcu_read_lock protection. | |
571ecf67 | 2179 | */ |
71ebb4aa RR |
2180 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
2181 | struct sk_buff *skb, | |
2182 | struct ieee80211_rx_status *status, | |
8318d78a | 2183 | struct ieee80211_rate *rate) |
571ecf67 JB |
2184 | { |
2185 | struct ieee80211_local *local = hw_to_local(hw); | |
2186 | struct ieee80211_sub_if_data *sdata; | |
571ecf67 | 2187 | struct ieee80211_hdr *hdr; |
5cf121c3 | 2188 | struct ieee80211_rx_data rx; |
6368e4b1 | 2189 | int prepares; |
8e6f0032 JB |
2190 | struct ieee80211_sub_if_data *prev = NULL; |
2191 | struct sk_buff *skb_new; | |
571ecf67 | 2192 | |
358c8d9d | 2193 | hdr = (struct ieee80211_hdr *)skb->data; |
571ecf67 JB |
2194 | memset(&rx, 0, sizeof(rx)); |
2195 | rx.skb = skb; | |
2196 | rx.local = local; | |
2197 | ||
5cf121c3 | 2198 | rx.status = status; |
5cf121c3 | 2199 | rx.rate = rate; |
72abd81b | 2200 | |
358c8d9d | 2201 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
571ecf67 | 2202 | local->dot11ReceivedFragmentCount++; |
571ecf67 | 2203 | |
8944b79f JB |
2204 | rx.sta = sta_info_get(local, hdr->addr2); |
2205 | if (rx.sta) { | |
d0709a65 JB |
2206 | rx.sdata = rx.sta->sdata; |
2207 | rx.dev = rx.sta->sdata->dev; | |
b2e7771e | 2208 | } |
571ecf67 | 2209 | |
571ecf67 | 2210 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
8944b79f | 2211 | ieee80211_rx_michael_mic_report(local->mdev, hdr, &rx); |
d0709a65 | 2212 | return; |
571ecf67 JB |
2213 | } |
2214 | ||
c2b13452 | 2215 | if (unlikely(local->sw_scanning || local->hw_scanning)) |
5cf121c3 | 2216 | rx.flags |= IEEE80211_RX_IN_SCAN; |
571ecf67 | 2217 | |
38f3714d | 2218 | ieee80211_parse_qos(&rx); |
d1c3a37c | 2219 | ieee80211_verify_alignment(&rx); |
38f3714d | 2220 | |
571ecf67 JB |
2221 | skb = rx.skb; |
2222 | ||
79010420 | 2223 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
2a8a9a88 JB |
2224 | if (!netif_running(sdata->dev)) |
2225 | continue; | |
2226 | ||
05c914fe | 2227 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
b2e7771e JB |
2228 | continue; |
2229 | ||
5cf121c3 | 2230 | rx.flags |= IEEE80211_RX_RA_MATCH; |
7ab17c45 | 2231 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
23a24def | 2232 | |
6368e4b1 | 2233 | if (!prepares) |
23a24def | 2234 | continue; |
8e6f0032 | 2235 | |
340e11f3 JB |
2236 | /* |
2237 | * frame is destined for this interface, but if it's not | |
2238 | * also for the previous one we handle that after the | |
2239 | * loop to avoid copying the SKB once too much | |
2240 | */ | |
2241 | ||
2242 | if (!prev) { | |
2243 | prev = sdata; | |
2244 | continue; | |
8e6f0032 | 2245 | } |
340e11f3 JB |
2246 | |
2247 | /* | |
2248 | * frame was destined for the previous interface | |
2249 | * so invoke RX handlers for it | |
2250 | */ | |
2251 | ||
2252 | skb_new = skb_copy(skb, GFP_ATOMIC); | |
2253 | if (!skb_new) { | |
2254 | if (net_ratelimit()) | |
2255 | printk(KERN_DEBUG "%s: failed to copy " | |
a4278e18 | 2256 | "multicast frame for %s\n", |
dd1cd4c6 JB |
2257 | wiphy_name(local->hw.wiphy), |
2258 | prev->dev->name); | |
340e11f3 JB |
2259 | continue; |
2260 | } | |
8944b79f | 2261 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
8e6f0032 | 2262 | prev = sdata; |
571ecf67 | 2263 | } |
a4b7d7bd | 2264 | if (prev) |
8944b79f | 2265 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
a4b7d7bd | 2266 | else |
8e6f0032 | 2267 | dev_kfree_skb(skb); |
571ecf67 | 2268 | } |
6368e4b1 | 2269 | |
b580781e RR |
2270 | #define SEQ_MODULO 0x1000 |
2271 | #define SEQ_MASK 0xfff | |
2272 | ||
2273 | static inline int seq_less(u16 sq1, u16 sq2) | |
2274 | { | |
c6a1fa12 | 2275 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
b580781e RR |
2276 | } |
2277 | ||
2278 | static inline u16 seq_inc(u16 sq) | |
2279 | { | |
c6a1fa12 | 2280 | return (sq + 1) & SEQ_MASK; |
b580781e RR |
2281 | } |
2282 | ||
2283 | static inline u16 seq_sub(u16 sq1, u16 sq2) | |
2284 | { | |
c6a1fa12 | 2285 | return (sq1 - sq2) & SEQ_MASK; |
b580781e RR |
2286 | } |
2287 | ||
2288 | ||
71364716 RR |
2289 | /* |
2290 | * As it function blongs to Rx path it must be called with | |
2291 | * the proper rcu_read_lock protection for its flow. | |
2292 | */ | |
c6a1fa12 JB |
2293 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
2294 | struct tid_ampdu_rx *tid_agg_rx, | |
2295 | struct sk_buff *skb, | |
2296 | u16 mpdu_seq_num, | |
2297 | int bar_req) | |
b580781e RR |
2298 | { |
2299 | struct ieee80211_local *local = hw_to_local(hw); | |
2300 | struct ieee80211_rx_status status; | |
2301 | u16 head_seq_num, buf_size; | |
2302 | int index; | |
8318d78a JB |
2303 | struct ieee80211_supported_band *sband; |
2304 | struct ieee80211_rate *rate; | |
b580781e RR |
2305 | |
2306 | buf_size = tid_agg_rx->buf_size; | |
2307 | head_seq_num = tid_agg_rx->head_seq_num; | |
2308 | ||
2309 | /* frame with out of date sequence number */ | |
2310 | if (seq_less(mpdu_seq_num, head_seq_num)) { | |
2311 | dev_kfree_skb(skb); | |
2312 | return 1; | |
2313 | } | |
2314 | ||
2315 | /* if frame sequence number exceeds our buffering window size or | |
2316 | * block Ack Request arrived - release stored frames */ | |
2317 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { | |
2318 | /* new head to the ordering buffer */ | |
2319 | if (bar_req) | |
2320 | head_seq_num = mpdu_seq_num; | |
2321 | else | |
2322 | head_seq_num = | |
2323 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); | |
2324 | /* release stored frames up to new head to stack */ | |
2325 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { | |
2326 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2327 | tid_agg_rx->ssn) | |
2328 | % tid_agg_rx->buf_size; | |
2329 | ||
2330 | if (tid_agg_rx->reorder_buf[index]) { | |
2331 | /* release the reordered frames to stack */ | |
2332 | memcpy(&status, | |
2333 | tid_agg_rx->reorder_buf[index]->cb, | |
2334 | sizeof(status)); | |
8318d78a | 2335 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2336 | if (status.flag & RX_FLAG_HT) { |
2337 | /* TODO: HT rates */ | |
2338 | rate = sband->bitrates; | |
2339 | } else { | |
2340 | rate = &sband->bitrates | |
2341 | [status.rate_idx]; | |
2342 | } | |
b580781e RR |
2343 | __ieee80211_rx_handle_packet(hw, |
2344 | tid_agg_rx->reorder_buf[index], | |
9e72ebd6 | 2345 | &status, rate); |
b580781e RR |
2346 | tid_agg_rx->stored_mpdu_num--; |
2347 | tid_agg_rx->reorder_buf[index] = NULL; | |
2348 | } | |
2349 | tid_agg_rx->head_seq_num = | |
2350 | seq_inc(tid_agg_rx->head_seq_num); | |
2351 | } | |
2352 | if (bar_req) | |
2353 | return 1; | |
2354 | } | |
2355 | ||
2356 | /* now the new frame is always in the range of the reordering */ | |
2357 | /* buffer window */ | |
2358 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) | |
2359 | % tid_agg_rx->buf_size; | |
2360 | /* check if we already stored this frame */ | |
2361 | if (tid_agg_rx->reorder_buf[index]) { | |
2362 | dev_kfree_skb(skb); | |
2363 | return 1; | |
2364 | } | |
2365 | ||
2366 | /* if arrived mpdu is in the right order and nothing else stored */ | |
2367 | /* release it immediately */ | |
2368 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && | |
2369 | tid_agg_rx->stored_mpdu_num == 0) { | |
2370 | tid_agg_rx->head_seq_num = | |
2371 | seq_inc(tid_agg_rx->head_seq_num); | |
2372 | return 0; | |
2373 | } | |
2374 | ||
2375 | /* put the frame in the reordering buffer */ | |
2376 | tid_agg_rx->reorder_buf[index] = skb; | |
2377 | tid_agg_rx->stored_mpdu_num++; | |
2378 | /* release the buffer until next missing frame */ | |
2379 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) | |
2380 | % tid_agg_rx->buf_size; | |
2381 | while (tid_agg_rx->reorder_buf[index]) { | |
2382 | /* release the reordered frame back to stack */ | |
2383 | memcpy(&status, tid_agg_rx->reorder_buf[index]->cb, | |
2384 | sizeof(status)); | |
8318d78a | 2385 | sband = local->hw.wiphy->bands[status.band]; |
0fb8ca45 JM |
2386 | if (status.flag & RX_FLAG_HT) |
2387 | rate = sband->bitrates; /* TODO: HT rates */ | |
2388 | else | |
2389 | rate = &sband->bitrates[status.rate_idx]; | |
b580781e | 2390 | __ieee80211_rx_handle_packet(hw, tid_agg_rx->reorder_buf[index], |
9e72ebd6 | 2391 | &status, rate); |
b580781e RR |
2392 | tid_agg_rx->stored_mpdu_num--; |
2393 | tid_agg_rx->reorder_buf[index] = NULL; | |
2394 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); | |
2395 | index = seq_sub(tid_agg_rx->head_seq_num, | |
2396 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; | |
2397 | } | |
2398 | return 1; | |
2399 | } | |
2400 | ||
71ebb4aa RR |
2401 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
2402 | struct sk_buff *skb) | |
b580781e RR |
2403 | { |
2404 | struct ieee80211_hw *hw = &local->hw; | |
2405 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2406 | struct sta_info *sta; | |
2407 | struct tid_ampdu_rx *tid_agg_rx; | |
87228f57 | 2408 | u16 sc; |
b580781e | 2409 | u16 mpdu_seq_num; |
182503ab | 2410 | u8 ret = 0; |
b580781e RR |
2411 | int tid; |
2412 | ||
2413 | sta = sta_info_get(local, hdr->addr2); | |
2414 | if (!sta) | |
2415 | return ret; | |
2416 | ||
b580781e RR |
2417 | /* filter the QoS data rx stream according to |
2418 | * STA/TID and check if this STA/TID is on aggregation */ | |
87228f57 | 2419 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
b580781e RR |
2420 | goto end_reorder; |
2421 | ||
238f74a2 | 2422 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
b580781e | 2423 | |
cee24a3e | 2424 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
b580781e RR |
2425 | goto end_reorder; |
2426 | ||
cee24a3e RR |
2427 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
2428 | ||
2560b6e2 EG |
2429 | /* qos null data frames are excluded */ |
2430 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) | |
b580781e RR |
2431 | goto end_reorder; |
2432 | ||
2433 | /* new un-ordered ampdu frame - process it */ | |
2434 | ||
2435 | /* reset session timer */ | |
20ad19d0 JB |
2436 | if (tid_agg_rx->timeout) |
2437 | mod_timer(&tid_agg_rx->session_timer, | |
2438 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); | |
b580781e RR |
2439 | |
2440 | /* if this mpdu is fragmented - terminate rx aggregation session */ | |
2441 | sc = le16_to_cpu(hdr->seq_ctrl); | |
2442 | if (sc & IEEE80211_SCTL_FRAG) { | |
17741cdc | 2443 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
b580781e RR |
2444 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
2445 | ret = 1; | |
2446 | goto end_reorder; | |
2447 | } | |
2448 | ||
2449 | /* according to mpdu sequence number deal with reordering buffer */ | |
2450 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; | |
2451 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, | |
2452 | mpdu_seq_num, 0); | |
d0709a65 | 2453 | end_reorder: |
b580781e RR |
2454 | return ret; |
2455 | } | |
2456 | ||
6368e4b1 RR |
2457 | /* |
2458 | * This is the receive path handler. It is called by a low level driver when an | |
2459 | * 802.11 MPDU is received from the hardware. | |
2460 | */ | |
2461 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2462 | struct ieee80211_rx_status *status) | |
2463 | { | |
2464 | struct ieee80211_local *local = hw_to_local(hw); | |
8318d78a JB |
2465 | struct ieee80211_rate *rate = NULL; |
2466 | struct ieee80211_supported_band *sband; | |
2467 | ||
2468 | if (status->band < 0 || | |
13d8fd2d | 2469 | status->band >= IEEE80211_NUM_BANDS) { |
8318d78a JB |
2470 | WARN_ON(1); |
2471 | return; | |
2472 | } | |
2473 | ||
2474 | sband = local->hw.wiphy->bands[status->band]; | |
0fb8ca45 | 2475 | if (!sband) { |
8318d78a JB |
2476 | WARN_ON(1); |
2477 | return; | |
2478 | } | |
2479 | ||
0fb8ca45 JM |
2480 | if (status->flag & RX_FLAG_HT) { |
2481 | /* rate_idx is MCS index */ | |
2482 | if (WARN_ON(status->rate_idx < 0 || | |
2483 | status->rate_idx >= 76)) | |
2484 | return; | |
2485 | /* HT rates are not in the table - use the highest legacy rate | |
2486 | * for now since other parts of mac80211 may not yet be fully | |
2487 | * MCS aware. */ | |
2488 | rate = &sband->bitrates[sband->n_bitrates - 1]; | |
2489 | } else { | |
2490 | if (WARN_ON(status->rate_idx < 0 || | |
2491 | status->rate_idx >= sband->n_bitrates)) | |
2492 | return; | |
2493 | rate = &sband->bitrates[status->rate_idx]; | |
2494 | } | |
6368e4b1 RR |
2495 | |
2496 | /* | |
2497 | * key references and virtual interfaces are protected using RCU | |
2498 | * and this requires that we are in a read-side RCU section during | |
2499 | * receive processing | |
2500 | */ | |
2501 | rcu_read_lock(); | |
2502 | ||
2503 | /* | |
2504 | * Frames with failed FCS/PLCP checksum are not returned, | |
2505 | * all other frames are returned without radiotap header | |
2506 | * if it was previously present. | |
2507 | * Also, frames with less than 16 bytes are dropped. | |
2508 | */ | |
8318d78a | 2509 | skb = ieee80211_rx_monitor(local, skb, status, rate); |
6368e4b1 RR |
2510 | if (!skb) { |
2511 | rcu_read_unlock(); | |
2512 | return; | |
2513 | } | |
2514 | ||
b580781e | 2515 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
9e72ebd6 | 2516 | __ieee80211_rx_handle_packet(hw, skb, status, rate); |
6368e4b1 RR |
2517 | |
2518 | rcu_read_unlock(); | |
2519 | } | |
571ecf67 JB |
2520 | EXPORT_SYMBOL(__ieee80211_rx); |
2521 | ||
2522 | /* This is a version of the rx handler that can be called from hard irq | |
2523 | * context. Post the skb on the queue and schedule the tasklet */ | |
2524 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb, | |
2525 | struct ieee80211_rx_status *status) | |
2526 | { | |
2527 | struct ieee80211_local *local = hw_to_local(hw); | |
2528 | ||
2529 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); | |
2530 | ||
2531 | skb->dev = local->mdev; | |
2532 | /* copy status into skb->cb for use by tasklet */ | |
2533 | memcpy(skb->cb, status, sizeof(*status)); | |
2534 | skb->pkt_type = IEEE80211_RX_MSG; | |
2535 | skb_queue_tail(&local->skb_queue, skb); | |
2536 | tasklet_schedule(&local->tasklet); | |
2537 | } | |
2538 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |