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modules: fix module waiting for dependent modules' init
[wrt350n-kernel.git] / net / mac80211 / wpa.c
blob6f04311cf0a07922727ace9373291ce5f04b9270
1 /*
2 * Copyright 2002-2004, Instant802 Networks, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/netdevice.h>
10 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/skbuff.h>
13 #include <linux/compiler.h>
14 #include <net/mac80211.h>
15
16 #include "ieee80211_i.h"
17 #include "michael.h"
18 #include "tkip.h"
19 #include "aes_ccm.h"
20 #include "wpa.h"
21
22 static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
23 u8 *qos_tid, u8 **data, size_t *data_len)
24 {
25 struct ieee80211_hdr *hdr;
26 size_t hdrlen;
27 u16 fc;
28 int a4_included;
29 u8 *pos;
30
31 hdr = (struct ieee80211_hdr *) skb->data;
32 fc = le16_to_cpu(hdr->frame_control);
33
34 hdrlen = 24;
35 if ((fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) ==
36 (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
37 hdrlen += ETH_ALEN;
38 *sa = hdr->addr4;
39 *da = hdr->addr3;
40 } else if (fc & IEEE80211_FCTL_FROMDS) {
41 *sa = hdr->addr3;
42 *da = hdr->addr1;
43 } else if (fc & IEEE80211_FCTL_TODS) {
44 *sa = hdr->addr2;
45 *da = hdr->addr3;
46 } else {
47 *sa = hdr->addr2;
48 *da = hdr->addr1;
49 }
50
51 if (fc & 0x80)
52 hdrlen += 2;
53
54 *data = skb->data + hdrlen;
55 *data_len = skb->len - hdrlen;
56
57 a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
58 (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
59 if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
60 fc & IEEE80211_STYPE_QOS_DATA) {
61 pos = (u8 *) &hdr->addr4;
62 if (a4_included)
63 pos += 6;
64 *qos_tid = pos[0] & 0x0f;
65 *qos_tid |= 0x80; /* qos_included flag */
66 } else
67 *qos_tid = 0;
68
69 return skb->len < hdrlen ? -1 : 0;
70 }
71
72
73 ieee80211_txrx_result
74 ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
75 {
76 u8 *data, *sa, *da, *key, *mic, qos_tid;
77 size_t data_len;
78 u16 fc;
79 struct sk_buff *skb = tx->skb;
80 int authenticator;
81 int wpa_test = 0;
82
83 fc = tx->fc;
84
85 if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
86 !WLAN_FC_DATA_PRESENT(fc))
87 return TXRX_CONTINUE;
88
89 if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
90 return TXRX_DROP;
91
92 if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
93 !(tx->flags & IEEE80211_TXRXD_FRAGMENTED) &&
94 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
95 !wpa_test) {
96 /* hwaccel - with no need for preallocated room for Michael MIC
97 */
98 return TXRX_CONTINUE;
99 }
100
101 if (skb_tailroom(skb) < MICHAEL_MIC_LEN) {
102 I802_DEBUG_INC(tx->local->tx_expand_skb_head);
103 if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN,
104 MICHAEL_MIC_LEN + TKIP_ICV_LEN,
105 GFP_ATOMIC))) {
106 printk(KERN_DEBUG "%s: failed to allocate more memory "
107 "for Michael MIC\n", tx->dev->name);
108 return TXRX_DROP;
109 }
110 }
111
112 #if 0
113 authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
114 #else
115 authenticator = 1;
116 #endif
117 key = &tx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
118 ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
119 mic = skb_put(skb, MICHAEL_MIC_LEN);
120 michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
121
122 return TXRX_CONTINUE;
123 }
124
125
126 ieee80211_txrx_result
127 ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
128 {
129 u8 *data, *sa, *da, *key = NULL, qos_tid;
130 size_t data_len;
131 u16 fc;
132 u8 mic[MICHAEL_MIC_LEN];
133 struct sk_buff *skb = rx->skb;
134 int authenticator = 1, wpa_test = 0;
135 DECLARE_MAC_BUF(mac);
136
137 fc = rx->fc;
138
139 /*
140 * No way to verify the MIC if the hardware stripped it
141 */
142 if (rx->u.rx.status->flag & RX_FLAG_MMIC_STRIPPED)
143 return TXRX_CONTINUE;
144
145 if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
146 !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc))
147 return TXRX_CONTINUE;
148
149 if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
150 || data_len < MICHAEL_MIC_LEN)
151 return TXRX_DROP;
152
153 data_len -= MICHAEL_MIC_LEN;
154
155 #if 0
156 authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
157 #else
158 authenticator = 1;
159 #endif
160 key = &rx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
161 ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
162 michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
163 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
164 if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
165 return TXRX_DROP;
166
167 printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
168 "%s\n", rx->dev->name, print_mac(mac, sa));
169
170 mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
171 (void *) skb->data);
172 return TXRX_DROP;
173 }
174
175 /* remove Michael MIC from payload */
176 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
177
178 /* update IV in key information to be able to detect replays */
179 rx->key->u.tkip.iv32_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv32;
180 rx->key->u.tkip.iv16_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv16;
181
182 return TXRX_CONTINUE;
183 }
184
185
186 static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
187 struct sk_buff *skb, int test)
188 {
189 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
190 struct ieee80211_key *key = tx->key;
191 int hdrlen, len, tailneed;
192 u16 fc;
193 u8 *pos;
194
195 fc = le16_to_cpu(hdr->frame_control);
196 hdrlen = ieee80211_get_hdrlen(fc);
197 len = skb->len - hdrlen;
198
199 if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
200 tailneed = 0;
201 else
202 tailneed = TKIP_ICV_LEN;
203
204 if ((skb_headroom(skb) < TKIP_IV_LEN ||
205 skb_tailroom(skb) < tailneed)) {
206 I802_DEBUG_INC(tx->local->tx_expand_skb_head);
207 if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed,
208 GFP_ATOMIC)))
209 return -1;
210 }
211
212 pos = skb_push(skb, TKIP_IV_LEN);
213 memmove(pos, pos + TKIP_IV_LEN, hdrlen);
214 pos += hdrlen;
215
216 /* Increase IV for the frame */
217 key->u.tkip.iv16++;
218 if (key->u.tkip.iv16 == 0)
219 key->u.tkip.iv32++;
220
221 if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
222 hdr = (struct ieee80211_hdr *)skb->data;
223
224 /* hwaccel - with preallocated room for IV */
225 ieee80211_tkip_add_iv(pos, key,
226 (u8) (key->u.tkip.iv16 >> 8),
227 (u8) (((key->u.tkip.iv16 >> 8) | 0x20) &
228 0x7f),
229 (u8) key->u.tkip.iv16);
230
231 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
232 return 0;
233 }
234
235 /* Add room for ICV */
236 skb_put(skb, TKIP_ICV_LEN);
237
238 hdr = (struct ieee80211_hdr *) skb->data;
239 ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
240 key, pos, len, hdr->addr2);
241 return 0;
242 }
243
244
245 ieee80211_txrx_result
246 ieee80211_crypto_tkip_encrypt(struct ieee80211_txrx_data *tx)
247 {
248 struct sk_buff *skb = tx->skb;
249 int wpa_test = 0, test = 0;
250
251 tx->u.tx.control->icv_len = TKIP_ICV_LEN;
252 tx->u.tx.control->iv_len = TKIP_IV_LEN;
253 ieee80211_tx_set_iswep(tx);
254
255 if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
256 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
257 !wpa_test) {
258 /* hwaccel - with no need for preallocated room for IV/ICV */
259 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
260 return TXRX_CONTINUE;
261 }
262
263 if (tkip_encrypt_skb(tx, skb, test) < 0)
264 return TXRX_DROP;
265
266 if (tx->u.tx.extra_frag) {
267 int i;
268 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
269 if (tkip_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
270 < 0)
271 return TXRX_DROP;
272 }
273 }
274
275 return TXRX_CONTINUE;
276 }
277
278
279 ieee80211_txrx_result
280 ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
281 {
282 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
283 u16 fc;
284 int hdrlen, res, hwaccel = 0, wpa_test = 0;
285 struct ieee80211_key *key = rx->key;
286 struct sk_buff *skb = rx->skb;
287 DECLARE_MAC_BUF(mac);
288
289 fc = le16_to_cpu(hdr->frame_control);
290 hdrlen = ieee80211_get_hdrlen(fc);
291
292 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
293 return TXRX_CONTINUE;
294
295 if (!rx->sta || skb->len - hdrlen < 12)
296 return TXRX_DROP;
297
298 if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) {
299 if (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) {
300 /*
301 * Hardware took care of all processing, including
302 * replay protection, and stripped the ICV/IV so
303 * we cannot do any checks here.
304 */
305 return TXRX_CONTINUE;
306 }
307
308 /* let TKIP code verify IV, but skip decryption */
309 hwaccel = 1;
310 }
311
312 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
313 key, skb->data + hdrlen,
314 skb->len - hdrlen, rx->sta->addr,
315 hwaccel, rx->u.rx.queue,
316 &rx->u.rx.tkip_iv32,
317 &rx->u.rx.tkip_iv16);
318 if (res != TKIP_DECRYPT_OK || wpa_test) {
319 #ifdef CONFIG_MAC80211_DEBUG
320 if (net_ratelimit())
321 printk(KERN_DEBUG "%s: TKIP decrypt failed for RX "
322 "frame from %s (res=%d)\n", rx->dev->name,
323 print_mac(mac, rx->sta->addr), res);
324 #endif /* CONFIG_MAC80211_DEBUG */
325 return TXRX_DROP;
326 }
327
328 /* Trim ICV */
329 skb_trim(skb, skb->len - TKIP_ICV_LEN);
330
331 /* Remove IV */
332 memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
333 skb_pull(skb, TKIP_IV_LEN);
334
335 return TXRX_CONTINUE;
336 }
337
338
339 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
340 int encrypted)
341 {
342 u16 fc;
343 int a4_included, qos_included;
344 u8 qos_tid, *fc_pos, *data, *sa, *da;
345 int len_a;
346 size_t data_len;
347 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
348
349 fc_pos = (u8 *) &hdr->frame_control;
350 fc = fc_pos[0] ^ (fc_pos[1] << 8);
351 a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
352 (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
353
354 ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
355 data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
356 if (qos_tid & 0x80) {
357 qos_included = 1;
358 qos_tid &= 0x0f;
359 } else
360 qos_included = 0;
361 /* First block, b_0 */
362
363 b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
364 /* Nonce: QoS Priority | A2 | PN */
365 b_0[1] = qos_tid;
366 memcpy(&b_0[2], hdr->addr2, 6);
367 memcpy(&b_0[8], pn, CCMP_PN_LEN);
368 /* l(m) */
369 b_0[14] = (data_len >> 8) & 0xff;
370 b_0[15] = data_len & 0xff;
371
372
373 /* AAD (extra authenticate-only data) / masked 802.11 header
374 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
375
376 len_a = a4_included ? 28 : 22;
377 if (qos_included)
378 len_a += 2;
379
380 aad[0] = 0; /* (len_a >> 8) & 0xff; */
381 aad[1] = len_a & 0xff;
382 /* Mask FC: zero subtype b4 b5 b6 */
383 aad[2] = fc_pos[0] & ~(BIT(4) | BIT(5) | BIT(6));
384 /* Retry, PwrMgt, MoreData; set Protected */
385 aad[3] = (fc_pos[1] & ~(BIT(3) | BIT(4) | BIT(5))) | BIT(6);
386 memcpy(&aad[4], &hdr->addr1, 18);
387
388 /* Mask Seq#, leave Frag# */
389 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
390 aad[23] = 0;
391 if (a4_included) {
392 memcpy(&aad[24], hdr->addr4, 6);
393 aad[30] = 0;
394 aad[31] = 0;
395 } else
396 memset(&aad[24], 0, 8);
397 if (qos_included) {
398 u8 *dpos = &aad[a4_included ? 30 : 24];
399
400 /* Mask QoS Control field */
401 dpos[0] = qos_tid;
402 dpos[1] = 0;
403 }
404 }
405
406
407 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
408 {
409 hdr[0] = pn[5];
410 hdr[1] = pn[4];
411 hdr[2] = 0;
412 hdr[3] = 0x20 | (key_id << 6);
413 hdr[4] = pn[3];
414 hdr[5] = pn[2];
415 hdr[6] = pn[1];
416 hdr[7] = pn[0];
417 }
418
419
420 static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr)
421 {
422 pn[0] = hdr[7];
423 pn[1] = hdr[6];
424 pn[2] = hdr[5];
425 pn[3] = hdr[4];
426 pn[4] = hdr[1];
427 pn[5] = hdr[0];
428 return (hdr[3] >> 6) & 0x03;
429 }
430
431
432 static int ccmp_encrypt_skb(struct ieee80211_txrx_data *tx,
433 struct sk_buff *skb, int test)
434 {
435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
436 struct ieee80211_key *key = tx->key;
437 int hdrlen, len, tailneed;
438 u16 fc;
439 u8 *pos, *pn, *b_0, *aad, *scratch;
440 int i;
441
442 scratch = key->u.ccmp.tx_crypto_buf;
443 b_0 = scratch + 3 * AES_BLOCK_LEN;
444 aad = scratch + 4 * AES_BLOCK_LEN;
445
446 fc = le16_to_cpu(hdr->frame_control);
447 hdrlen = ieee80211_get_hdrlen(fc);
448 len = skb->len - hdrlen;
449
450 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
451 tailneed = 0;
452 else
453 tailneed = CCMP_MIC_LEN;
454
455 if ((skb_headroom(skb) < CCMP_HDR_LEN ||
456 skb_tailroom(skb) < tailneed)) {
457 I802_DEBUG_INC(tx->local->tx_expand_skb_head);
458 if (unlikely(pskb_expand_head(skb, CCMP_HDR_LEN, tailneed,
459 GFP_ATOMIC)))
460 return -1;
461 }
462
463 pos = skb_push(skb, CCMP_HDR_LEN);
464 memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
465 hdr = (struct ieee80211_hdr *) pos;
466 pos += hdrlen;
467
468 /* PN = PN + 1 */
469 pn = key->u.ccmp.tx_pn;
470
471 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
472 pn[i]++;
473 if (pn[i])
474 break;
475 }
476
477 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
478
479 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
480 /* hwaccel - with preallocated room for CCMP header */
481 tx->u.tx.control->key_idx = key->conf.hw_key_idx;
482 return 0;
483 }
484
485 pos += CCMP_HDR_LEN;
486 ccmp_special_blocks(skb, pn, b_0, aad, 0);
487 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
488 pos, skb_put(skb, CCMP_MIC_LEN));
489
490 return 0;
491 }
492
493
494 ieee80211_txrx_result
495 ieee80211_crypto_ccmp_encrypt(struct ieee80211_txrx_data *tx)
496 {
497 struct sk_buff *skb = tx->skb;
498 int test = 0;
499
500 tx->u.tx.control->icv_len = CCMP_MIC_LEN;
501 tx->u.tx.control->iv_len = CCMP_HDR_LEN;
502 ieee80211_tx_set_iswep(tx);
503
504 if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
505 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
506 /* hwaccel - with no need for preallocated room for CCMP "
507 * header or MIC fields */
508 tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
509 return TXRX_CONTINUE;
510 }
511
512 if (ccmp_encrypt_skb(tx, skb, test) < 0)
513 return TXRX_DROP;
514
515 if (tx->u.tx.extra_frag) {
516 int i;
517 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
518 if (ccmp_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
519 < 0)
520 return TXRX_DROP;
521 }
522 }
523
524 return TXRX_CONTINUE;
525 }
526
527
528 ieee80211_txrx_result
529 ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
530 {
531 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
532 u16 fc;
533 int hdrlen;
534 struct ieee80211_key *key = rx->key;
535 struct sk_buff *skb = rx->skb;
536 u8 pn[CCMP_PN_LEN];
537 int data_len;
538 DECLARE_MAC_BUF(mac);
539
540 fc = le16_to_cpu(hdr->frame_control);
541 hdrlen = ieee80211_get_hdrlen(fc);
542
543 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
544 return TXRX_CONTINUE;
545
546 data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
547 if (!rx->sta || data_len < 0)
548 return TXRX_DROP;
549
550 if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
551 (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
552 return TXRX_CONTINUE;
553
554 (void) ccmp_hdr2pn(pn, skb->data + hdrlen);
555
556 if (memcmp(pn, key->u.ccmp.rx_pn[rx->u.rx.queue], CCMP_PN_LEN) <= 0) {
557 #ifdef CONFIG_MAC80211_DEBUG
558 u8 *ppn = key->u.ccmp.rx_pn[rx->u.rx.queue];
559
560 printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
561 "%s (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
562 "%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
563 print_mac(mac, rx->sta->addr),
564 pn[0], pn[1], pn[2], pn[3], pn[4], pn[5],
565 ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
566 #endif /* CONFIG_MAC80211_DEBUG */
567 key->u.ccmp.replays++;
568 return TXRX_DROP;
569 }
570
571 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
572 /* hardware didn't decrypt/verify MIC */
573 u8 *scratch, *b_0, *aad;
574
575 scratch = key->u.ccmp.rx_crypto_buf;
576 b_0 = scratch + 3 * AES_BLOCK_LEN;
577 aad = scratch + 4 * AES_BLOCK_LEN;
578
579 ccmp_special_blocks(skb, pn, b_0, aad, 1);
580
581 if (ieee80211_aes_ccm_decrypt(
582 key->u.ccmp.tfm, scratch, b_0, aad,
583 skb->data + hdrlen + CCMP_HDR_LEN, data_len,
584 skb->data + skb->len - CCMP_MIC_LEN,
585 skb->data + hdrlen + CCMP_HDR_LEN)) {
586 #ifdef CONFIG_MAC80211_DEBUG
587 if (net_ratelimit())
588 printk(KERN_DEBUG "%s: CCMP decrypt failed "
589 "for RX frame from %s\n", rx->dev->name,
590 print_mac(mac, rx->sta->addr));
591 #endif /* CONFIG_MAC80211_DEBUG */
592 return TXRX_DROP;
593 }
594 }
595
596 memcpy(key->u.ccmp.rx_pn[rx->u.rx.queue], pn, CCMP_PN_LEN);
597
598 /* Remove CCMP header and MIC */
599 skb_trim(skb, skb->len - CCMP_MIC_LEN);
600 memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
601 skb_pull(skb, CCMP_HDR_LEN);
602
603 return TXRX_CONTINUE;
604 }
WRT350N Kernel Patches