1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * Copyright 2002-2004, Instant802 Networks, I
4 * Copyright 2008, Jouni Malinen <j@w1.fi>
5 * Copyright (C) 2016-2017 Intel Deutschland G
6 * Copyright (C) 2020-2023 Intel Corporation
7 */
8
9 #include <linux/netdevice.h>
10 #include <linux/types.h>
11 #include <linux/skbuff.h>
12 #include <linux/compiler.h>
13 #include <linux/ieee80211.h>
14 #include <linux/gfp.h>
15 #include <linux/unaligned.h>
16 #include <net/mac80211.h>
17 #include <crypto/aes.h>
18 #include <crypto/utils.h>
19
20 #include "ieee80211_i.h"
21 #include "michael.h"
22 #include "tkip.h"
23 #include "aes_ccm.h"
24 #include "aes_cmac.h"
25 #include "aes_gmac.h"
26 #include "aes_gcm.h"
27 #include "wpa.h"
28
29 ieee80211_tx_result
30 ieee80211_tx_h_michael_mic_add(struct ieee8021
31 {
32 u8 *data, *key, *mic;
33 size_t data_len;
34 unsigned int hdrlen;
35 struct ieee80211_hdr *hdr;
36 struct sk_buff *skb = tx->skb;
37 struct ieee80211_tx_info *info = IEEE8
38 int tail;
39
40 hdr = (struct ieee80211_hdr *)skb->dat
41 if (!tx->key || tx->key->conf.cipher !
42 skb->len < 24 || !ieee80211_is_dat
43 return TX_CONTINUE;
44
45 hdrlen = ieee80211_hdrlen(hdr->frame_c
46 if (skb->len < hdrlen)
47 return TX_DROP;
48
49 data = skb->data + hdrlen;
50 data_len = skb->len - hdrlen;
51
52 if (unlikely(info->flags & IEEE80211_T
53 /* Need to use software crypto
54 info->control.hw_key = NULL;
55 }
56
57 if (info->control.hw_key &&
58 (info->flags & IEEE80211_TX_CTL_DO
59 ieee80211_hw_check(&tx->local->hw
60 !(tx->key->conf.flags & (IEEE80211
61 IEEE80211
62 /* hwaccel - with no need for
63 return TX_CONTINUE;
64 }
65
66 tail = MICHAEL_MIC_LEN;
67 if (!info->control.hw_key)
68 tail += IEEE80211_TKIP_ICV_LEN
69
70 if (WARN(skb_tailroom(skb) < tail ||
71 skb_headroom(skb) < IEEE80211
72 "mmic: not enough head/tail (
73 skb_headroom(skb), IEEE80211_
74 skb_tailroom(skb), tail))
75 return TX_DROP;
76
77 mic = skb_put(skb, MICHAEL_MIC_LEN);
78
79 if (tx->key->conf.flags & IEEE80211_KE
80 /* Zeroed MIC can help with de
81 memset(mic, 0, MICHAEL_MIC_LEN
82 return TX_CONTINUE;
83 }
84
85 key = &tx->key->conf.key[NL80211_TKIP_
86 michael_mic(key, hdr, data, data_len,
87 if (unlikely(info->flags & IEEE80211_T
88 mic[0]++;
89
90 return TX_CONTINUE;
91 }
92
93
94 ieee80211_rx_result
95 ieee80211_rx_h_michael_mic_verify(struct ieee8
96 {
97 u8 *data, *key = NULL;
98 size_t data_len;
99 unsigned int hdrlen;
100 u8 mic[MICHAEL_MIC_LEN];
101 struct sk_buff *skb = rx->skb;
102 struct ieee80211_rx_status *status = I
103 struct ieee80211_hdr *hdr = (struct ie
104
105 /*
106 * it makes no sense to check for MIC
107 * than data frames.
108 */
109 if (!ieee80211_is_data_present(hdr->fr
110 return RX_CONTINUE;
111
112 /*
113 * No way to verify the MIC if the har
114 * the IV with the key index. In this
115 * on the driver to set RX_FLAG_MMIC_E
116 * MIC failure report.
117 */
118 if (status->flag & (RX_FLAG_MMIC_STRIP
119 if (status->flag & RX_FLAG_MMI
120 goto mic_fail_no_key;
121
122 if (!(status->flag & RX_FLAG_I
123 rx->key->conf.cipher == WL
124 goto update_iv;
125
126 return RX_CONTINUE;
127 }
128
129 /*
130 * Some hardware seems to generate Mic
131 * though, the frame was not encrypted
132 * MIC. Ignore the flag them to avoid
133 */
134 if (!rx->key || rx->key->conf.cipher !
135 !(status->flag & RX_FLAG_DECRYPTED
136 return RX_CONTINUE;
137
138 if (rx->sdata->vif.type == NL80211_IFT
139 /*
140 * APs with pairwise keys shou
141 * errors for non-zero keyidx
142 * group keys and only the AP
143 * frames in the BSS.
144 */
145 return RX_DROP_U_AP_RX_GROUPCA
146 }
147
148 if (status->flag & RX_FLAG_MMIC_ERROR)
149 goto mic_fail;
150
151 hdrlen = ieee80211_hdrlen(hdr->frame_c
152 if (skb->len < hdrlen + MICHAEL_MIC_LE
153 return RX_DROP_U_SHORT_MMIC;
154
155 if (skb_linearize(rx->skb))
156 return RX_DROP_U_OOM;
157 hdr = (void *)skb->data;
158
159 data = skb->data + hdrlen;
160 data_len = skb->len - hdrlen - MICHAEL
161 key = &rx->key->conf.key[NL80211_TKIP_
162 michael_mic(key, hdr, data, data_len,
163 if (crypto_memneq(mic, data + data_len
164 goto mic_fail;
165
166 /* remove Michael MIC from payload */
167 skb_trim(skb, skb->len - MICHAEL_MIC_L
168
169 update_iv:
170 /* update IV in key information to be
171 rx->key->u.tkip.rx[rx->security_idx].i
172 rx->key->u.tkip.rx[rx->security_idx].i
173
174 return RX_CONTINUE;
175
176 mic_fail:
177 rx->key->u.tkip.mic_failures++;
178
179 mic_fail_no_key:
180 /*
181 * In some cases the key can be unset
182 * a driver that supports HW encryptio
183 * the key is set.
184 */
185 cfg80211_michael_mic_failure(rx->sdata
186 is_multic
187 NL80211_K
188 NL80211_K
189 rx->key ?
190 NULL, GFP
191 return RX_DROP_U_MMIC_FAIL;
192 }
193
194 static int tkip_encrypt_skb(struct ieee80211_t
195 {
196 struct ieee80211_hdr *hdr = (struct ie
197 struct ieee80211_key *key = tx->key;
198 struct ieee80211_tx_info *info = IEEE8
199 unsigned int hdrlen;
200 int len, tail;
201 u64 pn;
202 u8 *pos;
203
204 if (info->control.hw_key &&
205 !(info->control.hw_key->flags & IE
206 !(info->control.hw_key->flags & IE
207 /* hwaccel - with no need for
208 return 0;
209 }
210
211 hdrlen = ieee80211_hdrlen(hdr->frame_c
212 len = skb->len - hdrlen;
213
214 if (info->control.hw_key)
215 tail = 0;
216 else
217 tail = IEEE80211_TKIP_ICV_LEN;
218
219 if (WARN_ON(skb_tailroom(skb) < tail |
220 skb_headroom(skb) < IEEE80
221 return -1;
222
223 pos = skb_push(skb, IEEE80211_TKIP_IV_
224 memmove(pos, pos + IEEE80211_TKIP_IV_L
225 pos += hdrlen;
226
227 /* the HW only needs room for the IV,
228 if (info->control.hw_key &&
229 (info->control.hw_key->flags & IEE
230 return 0;
231
232 /* Increase IV for the frame */
233 pn = atomic64_inc_return(&key->conf.tx
234 pos = ieee80211_tkip_add_iv(pos, &key-
235
236 /* hwaccel - with software IV */
237 if (info->control.hw_key)
238 return 0;
239
240 /* Add room for ICV */
241 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
242
243 return ieee80211_tkip_encrypt_data(&tx
244 key
245 }
246
247
248 ieee80211_tx_result
249 ieee80211_crypto_tkip_encrypt(struct ieee80211
250 {
251 struct sk_buff *skb;
252
253 ieee80211_tx_set_protected(tx);
254
255 skb_queue_walk(&tx->skbs, skb) {
256 if (tkip_encrypt_skb(tx, skb)
257 return TX_DROP;
258 }
259
260 return TX_CONTINUE;
261 }
262
263
264 ieee80211_rx_result
265 ieee80211_crypto_tkip_decrypt(struct ieee80211
266 {
267 struct ieee80211_hdr *hdr = (struct ie
268 int hdrlen, res, hwaccel = 0;
269 struct ieee80211_key *key = rx->key;
270 struct sk_buff *skb = rx->skb;
271 struct ieee80211_rx_status *status = I
272
273 hdrlen = ieee80211_hdrlen(hdr->frame_c
274
275 if (!ieee80211_is_data(hdr->frame_cont
276 return RX_CONTINUE;
277
278 if (!rx->sta || skb->len - hdrlen < 12
279 return RX_DROP_U_SHORT_TKIP;
280
281 /* it may be possible to optimize this
282 if (skb_linearize(rx->skb))
283 return RX_DROP_U_OOM;
284 hdr = (void *)skb->data;
285
286 /*
287 * Let TKIP code verify IV, but skip d
288 * In the case where hardware checks t
289 * we don't even get here, see ieee802
290 */
291 if (status->flag & RX_FLAG_DECRYPTED)
292 hwaccel = 1;
293
294 res = ieee80211_tkip_decrypt_data(&rx-
295 key,
296 skb-
297 hdr-
298 &rx-
299 &rx-
300 if (res != TKIP_DECRYPT_OK)
301 return RX_DROP_U_TKIP_FAIL;
302
303 /* Trim ICV */
304 if (!(status->flag & RX_FLAG_ICV_STRIP
305 skb_trim(skb, skb->len - IEEE8
306
307 /* Remove IV */
308 memmove(skb->data + IEEE80211_TKIP_IV_
309 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
310
311 return RX_CONTINUE;
312 }
313
314 /*
315 * Calculate AAD for CCMP/GCMP, returning qos_
316 * need that in CCMP also for b_0.
317 */
318 static u8 ccmp_gcmp_aad(struct sk_buff *skb, u
319 {
320 struct ieee80211_hdr *hdr = (void *)sk
321 __le16 mask_fc;
322 int a4_included, mgmt;
323 u8 qos_tid;
324 u16 len_a = 22;
325
326 /*
327 * Mask FC: zero subtype b4 b5 b6 (if
328 * Retry, PwrMgt, MoreData, Order (if
329 */
330 mgmt = ieee80211_is_mgmt(hdr->frame_co
331 mask_fc = hdr->frame_control;
332 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL
333 IEEE80211_FCTL
334 if (!mgmt)
335 mask_fc &= ~cpu_to_le16(0x0070
336 mask_fc |= cpu_to_le16(IEEE80211_FCTL_
337
338 a4_included = ieee80211_has_a4(hdr->fr
339 if (a4_included)
340 len_a += 6;
341
342 if (ieee80211_is_data_qos(hdr->frame_c
343 qos_tid = *ieee80211_get_qos_c
344
345 if (spp_amsdu)
346 qos_tid &= IEEE80211_Q
347 IEEE80211_Q
348 else
349 qos_tid &= IEEE80211_Q
350
351 mask_fc &= ~cpu_to_le16(IEEE80
352 len_a += 2;
353 } else {
354 qos_tid = 0;
355 }
356
357 /* AAD (extra authenticate-only data)
358 * FC | A1 | A2 | A3 | SC | [A4] | [QC
359 put_unaligned_be16(len_a, &aad[0]);
360 put_unaligned(mask_fc, (__le16 *)&aad[
361 memcpy(&aad[4], &hdr->addrs, 3 * ETH_A
362
363 /* Mask Seq#, leave Frag# */
364 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0
365 aad[23] = 0;
366
367 if (a4_included) {
368 memcpy(&aad[24], hdr->addr4, E
369 aad[30] = qos_tid;
370 aad[31] = 0;
371 } else {
372 memset(&aad[24], 0, ETH_ALEN +
373 aad[24] = qos_tid;
374 }
375
376 return qos_tid;
377 }
378
379 static void ccmp_special_blocks(struct sk_buff
380 bool spp_amsdu
381 {
382 struct ieee80211_hdr *hdr = (struct ie
383 u8 qos_tid = ccmp_gcmp_aad(skb, aad, s
384
385 /* In CCM, the initial vectors (IV) us
386 * mode authentication are not allowed
387 * from this vector b_0. We only set L
388 * data size can be represented in (L+
389 * care of storing the data length in
390 * and clearing the other bits as is r
391 */
392 b_0[0] = 0x1;
393
394 /* Nonce: Nonce Flags | A2 | PN
395 * Nonce Flags: Priority (b0..b3) | Ma
396 */
397 b_0[1] = qos_tid | (ieee80211_is_mgmt(
398 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
399 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_
400 }
401
402 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn
403 {
404 hdr[0] = pn[5];
405 hdr[1] = pn[4];
406 hdr[2] = 0;
407 hdr[3] = 0x20 | (key_id << 6);
408 hdr[4] = pn[3];
409 hdr[5] = pn[2];
410 hdr[6] = pn[1];
411 hdr[7] = pn[0];
412 }
413
414
415 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr
416 {
417 pn[0] = hdr[7];
418 pn[1] = hdr[6];
419 pn[2] = hdr[5];
420 pn[3] = hdr[4];
421 pn[4] = hdr[1];
422 pn[5] = hdr[0];
423 }
424
425
426 static int ccmp_encrypt_skb(struct ieee80211_t
427 unsigned int mic_l
428 {
429 struct ieee80211_hdr *hdr = (struct ie
430 struct ieee80211_key *key = tx->key;
431 struct ieee80211_tx_info *info = IEEE8
432 int hdrlen, len, tail;
433 u8 *pos;
434 u8 pn[6];
435 u64 pn64;
436 u8 aad[CCM_AAD_LEN];
437 u8 b_0[AES_BLOCK_SIZE];
438
439 if (info->control.hw_key &&
440 !(info->control.hw_key->flags & IE
441 !(info->control.hw_key->flags & IE
442 !((info->control.hw_key->flags &
443 IEEE80211_KEY_FLAG_GENERATE_IV_
444 ieee80211_is_mgmt(hdr->frame_con
445 /*
446 * hwaccel has no need for pre
447 * header or MIC fields
448 */
449 return 0;
450 }
451
452 hdrlen = ieee80211_hdrlen(hdr->frame_c
453 len = skb->len - hdrlen;
454
455 if (info->control.hw_key)
456 tail = 0;
457 else
458 tail = mic_len;
459
460 if (WARN_ON(skb_tailroom(skb) < tail |
461 skb_headroom(skb) < IEEE80
462 return -1;
463
464 pos = skb_push(skb, IEEE80211_CCMP_HDR
465 memmove(pos, pos + IEEE80211_CCMP_HDR_
466
467 /* the HW only needs room for the IV,
468 if (info->control.hw_key &&
469 (info->control.hw_key->flags & IEE
470 return 0;
471
472 pos += hdrlen;
473
474 pn64 = atomic64_inc_return(&key->conf.
475
476 pn[5] = pn64;
477 pn[4] = pn64 >> 8;
478 pn[3] = pn64 >> 16;
479 pn[2] = pn64 >> 24;
480 pn[1] = pn64 >> 32;
481 pn[0] = pn64 >> 40;
482
483 ccmp_pn2hdr(pos, pn, key->conf.keyidx)
484
485 /* hwaccel - with software CCMP header
486 if (info->control.hw_key)
487 return 0;
488
489 pos += IEEE80211_CCMP_HDR_LEN;
490 ccmp_special_blocks(skb, pn, b_0, aad,
491 key->conf.flags &
492 return ieee80211_aes_ccm_encrypt(key->
493 skb_p
494 }
495
496
497 ieee80211_tx_result
498 ieee80211_crypto_ccmp_encrypt(struct ieee80211
499 unsigned int mic
500 {
501 struct sk_buff *skb;
502
503 ieee80211_tx_set_protected(tx);
504
505 skb_queue_walk(&tx->skbs, skb) {
506 if (ccmp_encrypt_skb(tx, skb,
507 return TX_DROP;
508 }
509
510 return TX_CONTINUE;
511 }
512
513
514 ieee80211_rx_result
515 ieee80211_crypto_ccmp_decrypt(struct ieee80211
516 unsigned int mic
517 {
518 struct ieee80211_hdr *hdr = (struct ie
519 int hdrlen;
520 struct ieee80211_key *key = rx->key;
521 struct sk_buff *skb = rx->skb;
522 struct ieee80211_rx_status *status = I
523 u8 pn[IEEE80211_CCMP_PN_LEN];
524 int data_len;
525 int queue;
526
527 hdrlen = ieee80211_hdrlen(hdr->frame_c
528
529 if (!ieee80211_is_data(hdr->frame_cont
530 !ieee80211_is_robust_mgmt_frame(sk
531 return RX_CONTINUE;
532
533 if (status->flag & RX_FLAG_DECRYPTED)
534 if (!pskb_may_pull(rx->skb, hd
535 return RX_DROP_U_SHORT
536 if (status->flag & RX_FLAG_MIC
537 mic_len = 0;
538 } else {
539 if (skb_linearize(rx->skb))
540 return RX_DROP_U_OOM;
541 }
542
543 /* reload hdr - skb might have been re
544 hdr = (void *)rx->skb->data;
545
546 data_len = skb->len - hdrlen - IEEE802
547 if (!rx->sta || data_len < 0)
548 return RX_DROP_U_SHORT_CCMP;
549
550 if (!(status->flag & RX_FLAG_PN_VALIDA
551 int res;
552
553 ccmp_hdr2pn(pn, skb->data + hd
554
555 queue = rx->security_idx;
556
557 res = memcmp(pn, key->u.ccmp.r
558 IEEE80211_CCMP_PN
559 if (res < 0 ||
560 (!res && !(status->flag &
561 key->u.ccmp.replays++;
562 return RX_DROP_U_REPLA
563 }
564
565 if (!(status->flag & RX_FLAG_D
566 u8 aad[2 * AES_BLOCK_S
567 u8 b_0[AES_BLOCK_SIZE]
568 /* hardware didn't dec
569 ccmp_special_blocks(sk
570 ke
571
572 if (ieee80211_aes_ccm_
573 key->u.ccm
574 skb->data
575 data_len,
576 skb->data
577 return RX_DROP
578 }
579
580 memcpy(key->u.ccmp.rx_pn[queue
581 if (unlikely(ieee80211_is_frag
582 memcpy(rx->ccm_gcm.pn,
583 }
584
585 /* Remove CCMP header and MIC */
586 if (pskb_trim(skb, skb->len - mic_len)
587 return RX_DROP_U_SHORT_CCMP_MI
588 memmove(skb->data + IEEE80211_CCMP_HDR
589 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
590
591 return RX_CONTINUE;
592 }
593
594 static void gcmp_special_blocks(struct sk_buff
595 bool spp_amsdu
596 {
597 struct ieee80211_hdr *hdr = (void *)sk
598
599 memcpy(j_0, hdr->addr2, ETH_ALEN);
600 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_G
601 j_0[13] = 0;
602 j_0[14] = 0;
603 j_0[AES_BLOCK_SIZE - 1] = 0x01;
604
605 ccmp_gcmp_aad(skb, aad, spp_amsdu);
606 }
607
608 static inline void gcmp_pn2hdr(u8 *hdr, const
609 {
610 hdr[0] = pn[5];
611 hdr[1] = pn[4];
612 hdr[2] = 0;
613 hdr[3] = 0x20 | (key_id << 6);
614 hdr[4] = pn[3];
615 hdr[5] = pn[2];
616 hdr[6] = pn[1];
617 hdr[7] = pn[0];
618 }
619
620 static inline void gcmp_hdr2pn(u8 *pn, const u
621 {
622 pn[0] = hdr[7];
623 pn[1] = hdr[6];
624 pn[2] = hdr[5];
625 pn[3] = hdr[4];
626 pn[4] = hdr[1];
627 pn[5] = hdr[0];
628 }
629
630 static int gcmp_encrypt_skb(struct ieee80211_t
631 {
632 struct ieee80211_hdr *hdr = (struct ie
633 struct ieee80211_key *key = tx->key;
634 struct ieee80211_tx_info *info = IEEE8
635 int hdrlen, len, tail;
636 u8 *pos;
637 u8 pn[6];
638 u64 pn64;
639 u8 aad[GCM_AAD_LEN];
640 u8 j_0[AES_BLOCK_SIZE];
641
642 if (info->control.hw_key &&
643 !(info->control.hw_key->flags & IE
644 !(info->control.hw_key->flags & IE
645 !((info->control.hw_key->flags &
646 IEEE80211_KEY_FLAG_GENERATE_IV_
647 ieee80211_is_mgmt(hdr->frame_con
648 /* hwaccel has no need for pre
649 * header or MIC fields
650 */
651 return 0;
652 }
653
654 hdrlen = ieee80211_hdrlen(hdr->frame_c
655 len = skb->len - hdrlen;
656
657 if (info->control.hw_key)
658 tail = 0;
659 else
660 tail = IEEE80211_GCMP_MIC_LEN;
661
662 if (WARN_ON(skb_tailroom(skb) < tail |
663 skb_headroom(skb) < IEEE80
664 return -1;
665
666 pos = skb_push(skb, IEEE80211_GCMP_HDR
667 memmove(pos, pos + IEEE80211_GCMP_HDR_
668 skb_set_network_header(skb, skb_networ
669 IEEE80211_
670
671 /* the HW only needs room for the IV,
672 if (info->control.hw_key &&
673 (info->control.hw_key->flags & IEE
674 return 0;
675
676 pos += hdrlen;
677
678 pn64 = atomic64_inc_return(&key->conf.
679
680 pn[5] = pn64;
681 pn[4] = pn64 >> 8;
682 pn[3] = pn64 >> 16;
683 pn[2] = pn64 >> 24;
684 pn[1] = pn64 >> 32;
685 pn[0] = pn64 >> 40;
686
687 gcmp_pn2hdr(pos, pn, key->conf.keyidx)
688
689 /* hwaccel - with software GCMP header
690 if (info->control.hw_key)
691 return 0;
692
693 pos += IEEE80211_GCMP_HDR_LEN;
694 gcmp_special_blocks(skb, pn, j_0, aad,
695 key->conf.flags &
696 return ieee80211_aes_gcm_encrypt(key->
697 skb_p
698 }
699
700 ieee80211_tx_result
701 ieee80211_crypto_gcmp_encrypt(struct ieee80211
702 {
703 struct sk_buff *skb;
704
705 ieee80211_tx_set_protected(tx);
706
707 skb_queue_walk(&tx->skbs, skb) {
708 if (gcmp_encrypt_skb(tx, skb)
709 return TX_DROP;
710 }
711
712 return TX_CONTINUE;
713 }
714
715 ieee80211_rx_result
716 ieee80211_crypto_gcmp_decrypt(struct ieee80211
717 {
718 struct ieee80211_hdr *hdr = (struct ie
719 int hdrlen;
720 struct ieee80211_key *key = rx->key;
721 struct sk_buff *skb = rx->skb;
722 struct ieee80211_rx_status *status = I
723 u8 pn[IEEE80211_GCMP_PN_LEN];
724 int data_len, queue, mic_len = IEEE802
725
726 hdrlen = ieee80211_hdrlen(hdr->frame_c
727
728 if (!ieee80211_is_data(hdr->frame_cont
729 !ieee80211_is_robust_mgmt_frame(sk
730 return RX_CONTINUE;
731
732 if (status->flag & RX_FLAG_DECRYPTED)
733 if (!pskb_may_pull(rx->skb, hd
734 return RX_DROP_U_SHORT
735 if (status->flag & RX_FLAG_MIC
736 mic_len = 0;
737 } else {
738 if (skb_linearize(rx->skb))
739 return RX_DROP_U_OOM;
740 }
741
742 /* reload hdr - skb might have been re
743 hdr = (void *)rx->skb->data;
744
745 data_len = skb->len - hdrlen - IEEE802
746 if (!rx->sta || data_len < 0)
747 return RX_DROP_U_SHORT_GCMP;
748
749 if (!(status->flag & RX_FLAG_PN_VALIDA
750 int res;
751
752 gcmp_hdr2pn(pn, skb->data + hd
753
754 queue = rx->security_idx;
755
756 res = memcmp(pn, key->u.gcmp.r
757 IEEE80211_GCMP_PN
758 if (res < 0 ||
759 (!res && !(status->flag &
760 key->u.gcmp.replays++;
761 return RX_DROP_U_REPLA
762 }
763
764 if (!(status->flag & RX_FLAG_D
765 u8 aad[2 * AES_BLOCK_S
766 u8 j_0[AES_BLOCK_SIZE]
767 /* hardware didn't dec
768 gcmp_special_blocks(sk
769 ke
770
771 if (ieee80211_aes_gcm_
772 key->u.gcm
773 skb->data
774 data_len,
775 skb->data
776 IEEE80211_
777 return RX_DROP
778 }
779
780 memcpy(key->u.gcmp.rx_pn[queue
781 if (unlikely(ieee80211_is_frag
782 memcpy(rx->ccm_gcm.pn,
783 }
784
785 /* Remove GCMP header and MIC */
786 if (pskb_trim(skb, skb->len - mic_len)
787 return RX_DROP_U_SHORT_GCMP_MI
788 memmove(skb->data + IEEE80211_GCMP_HDR
789 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
790
791 return RX_CONTINUE;
792 }
793
794 static void bip_aad(struct sk_buff *skb, u8 *a
795 {
796 __le16 mask_fc;
797 struct ieee80211_hdr *hdr = (struct ie
798
799 /* BIP AAD: FC(masked) || A1 || A2 ||
800
801 /* FC type/subtype */
802 /* Mask FC Retry, PwrMgt, MoreData fla
803 mask_fc = hdr->frame_control;
804 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL
805 IEEE80211_FCTL
806 put_unaligned(mask_fc, (__le16 *) &aad
807 /* A1 || A2 || A3 */
808 memcpy(aad + 2, &hdr->addrs, 3 * ETH_A
809 }
810
811
812 static inline void bip_ipn_set64(u8 *d, u64 pn
813 {
814 *d++ = pn;
815 *d++ = pn >> 8;
816 *d++ = pn >> 16;
817 *d++ = pn >> 24;
818 *d++ = pn >> 32;
819 *d = pn >> 40;
820 }
821
822 static inline void bip_ipn_swap(u8 *d, const u
823 {
824 *d++ = s[5];
825 *d++ = s[4];
826 *d++ = s[3];
827 *d++ = s[2];
828 *d++ = s[1];
829 *d = s[0];
830 }
831
832
833 ieee80211_tx_result
834 ieee80211_crypto_aes_cmac_encrypt(struct ieee8
835 {
836 struct sk_buff *skb;
837 struct ieee80211_tx_info *info;
838 struct ieee80211_key *key = tx->key;
839 struct ieee80211_mmie *mmie;
840 u8 aad[20];
841 u64 pn64;
842
843 if (WARN_ON(skb_queue_len(&tx->skbs) !
844 return TX_DROP;
845
846 skb = skb_peek(&tx->skbs);
847
848 info = IEEE80211_SKB_CB(skb);
849
850 if (info->control.hw_key &&
851 !(key->conf.flags & IEEE80211_KEY_
852 return TX_CONTINUE;
853
854 if (WARN_ON(skb_tailroom(skb) < sizeof
855 return TX_DROP;
856
857 mmie = skb_put(skb, sizeof(*mmie));
858 mmie->element_id = WLAN_EID_MMIE;
859 mmie->length = sizeof(*mmie) - 2;
860 mmie->key_id = cpu_to_le16(key->conf.k
861
862 /* PN = PN + 1 */
863 pn64 = atomic64_inc_return(&key->conf.
864
865 bip_ipn_set64(mmie->sequence_number, p
866
867 if (info->control.hw_key)
868 return TX_CONTINUE;
869
870 bip_aad(skb, aad);
871
872 /*
873 * MIC = AES-128-CMAC(IGTK, AAD || Man
874 */
875 ieee80211_aes_cmac(key->u.aes_cmac.tfm
876 skb->data + 24, skb
877
878 return TX_CONTINUE;
879 }
880
881 ieee80211_tx_result
882 ieee80211_crypto_aes_cmac_256_encrypt(struct i
883 {
884 struct sk_buff *skb;
885 struct ieee80211_tx_info *info;
886 struct ieee80211_key *key = tx->key;
887 struct ieee80211_mmie_16 *mmie;
888 u8 aad[20];
889 u64 pn64;
890
891 if (WARN_ON(skb_queue_len(&tx->skbs) !
892 return TX_DROP;
893
894 skb = skb_peek(&tx->skbs);
895
896 info = IEEE80211_SKB_CB(skb);
897
898 if (info->control.hw_key &&
899 !(key->conf.flags & IEEE80211_KEY_
900 return TX_CONTINUE;
901
902 if (WARN_ON(skb_tailroom(skb) < sizeof
903 return TX_DROP;
904
905 mmie = skb_put(skb, sizeof(*mmie));
906 mmie->element_id = WLAN_EID_MMIE;
907 mmie->length = sizeof(*mmie) - 2;
908 mmie->key_id = cpu_to_le16(key->conf.k
909
910 /* PN = PN + 1 */
911 pn64 = atomic64_inc_return(&key->conf.
912
913 bip_ipn_set64(mmie->sequence_number, p
914
915 if (info->control.hw_key)
916 return TX_CONTINUE;
917
918 bip_aad(skb, aad);
919
920 /* MIC = AES-256-CMAC(IGTK, AAD || Man
921 */
922 ieee80211_aes_cmac_256(key->u.aes_cmac
923 skb->data + 24,
924
925 return TX_CONTINUE;
926 }
927
928 ieee80211_rx_result
929 ieee80211_crypto_aes_cmac_decrypt(struct ieee8
930 {
931 struct sk_buff *skb = rx->skb;
932 struct ieee80211_rx_status *status = I
933 struct ieee80211_key *key = rx->key;
934 struct ieee80211_mmie *mmie;
935 u8 aad[20], mic[8], ipn[6];
936 struct ieee80211_hdr *hdr = (struct ie
937
938 if (!ieee80211_is_mgmt(hdr->frame_cont
939 return RX_CONTINUE;
940
941 /* management frames are already linea
942
943 if (skb->len < 24 + sizeof(*mmie))
944 return RX_DROP_U_SHORT_CMAC;
945
946 mmie = (struct ieee80211_mmie *)
947 (skb->data + skb->len - sizeof
948 if (mmie->element_id != WLAN_EID_MMIE
949 mmie->length != sizeof(*mmie) - 2)
950 return RX_DROP_U_BAD_MMIE; /*
951
952 bip_ipn_swap(ipn, mmie->sequence_numbe
953
954 if (memcmp(ipn, key->u.aes_cmac.rx_pn,
955 key->u.aes_cmac.replays++;
956 return RX_DROP_U_REPLAY;
957 }
958
959 if (!(status->flag & RX_FLAG_DECRYPTED
960 /* hardware didn't decrypt/ver
961 bip_aad(skb, aad);
962 ieee80211_aes_cmac(key->u.aes_
963 skb->data +
964 if (crypto_memneq(mic, mmie->m
965 key->u.aes_cmac.icverr
966 return RX_DROP_U_MIC_F
967 }
968 }
969
970 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
971
972 /* Remove MMIE */
973 skb_trim(skb, skb->len - sizeof(*mmie)
974
975 return RX_CONTINUE;
976 }
977
978 ieee80211_rx_result
979 ieee80211_crypto_aes_cmac_256_decrypt(struct i
980 {
981 struct sk_buff *skb = rx->skb;
982 struct ieee80211_rx_status *status = I
983 struct ieee80211_key *key = rx->key;
984 struct ieee80211_mmie_16 *mmie;
985 u8 aad[20], mic[16], ipn[6];
986 struct ieee80211_hdr *hdr = (struct ie
987
988 if (!ieee80211_is_mgmt(hdr->frame_cont
989 return RX_CONTINUE;
990
991 /* management frames are already linea
992
993 if (skb->len < 24 + sizeof(*mmie))
994 return RX_DROP_U_SHORT_CMAC256
995
996 mmie = (struct ieee80211_mmie_16 *)
997 (skb->data + skb->len - sizeof
998 if (mmie->element_id != WLAN_EID_MMIE
999 mmie->length != sizeof(*mmie) - 2)
1000 return RX_DROP_U_BAD_MMIE; /*
1001
1002 bip_ipn_swap(ipn, mmie->sequence_numb
1003
1004 if (memcmp(ipn, key->u.aes_cmac.rx_pn
1005 key->u.aes_cmac.replays++;
1006 return RX_DROP_U_REPLAY;
1007 }
1008
1009 if (!(status->flag & RX_FLAG_DECRYPTE
1010 /* hardware didn't decrypt/ve
1011 bip_aad(skb, aad);
1012 ieee80211_aes_cmac_256(key->u
1013 skb->d
1014 if (crypto_memneq(mic, mmie->
1015 key->u.aes_cmac.icver
1016 return RX_DROP_U_MIC_
1017 }
1018 }
1019
1020 memcpy(key->u.aes_cmac.rx_pn, ipn, 6)
1021
1022 /* Remove MMIE */
1023 skb_trim(skb, skb->len - sizeof(*mmie
1024
1025 return RX_CONTINUE;
1026 }
1027
1028 ieee80211_tx_result
1029 ieee80211_crypto_aes_gmac_encrypt(struct ieee
1030 {
1031 struct sk_buff *skb;
1032 struct ieee80211_tx_info *info;
1033 struct ieee80211_key *key = tx->key;
1034 struct ieee80211_mmie_16 *mmie;
1035 struct ieee80211_hdr *hdr;
1036 u8 aad[GMAC_AAD_LEN];
1037 u64 pn64;
1038 u8 nonce[GMAC_NONCE_LEN];
1039
1040 if (WARN_ON(skb_queue_len(&tx->skbs)
1041 return TX_DROP;
1042
1043 skb = skb_peek(&tx->skbs);
1044
1045 info = IEEE80211_SKB_CB(skb);
1046
1047 if (info->control.hw_key &&
1048 !(key->conf.flags & IEEE80211_KEY
1049 return TX_CONTINUE;
1050
1051 if (WARN_ON(skb_tailroom(skb) < sizeo
1052 return TX_DROP;
1053
1054 mmie = skb_put(skb, sizeof(*mmie));
1055 mmie->element_id = WLAN_EID_MMIE;
1056 mmie->length = sizeof(*mmie) - 2;
1057 mmie->key_id = cpu_to_le16(key->conf.
1058
1059 /* PN = PN + 1 */
1060 pn64 = atomic64_inc_return(&key->conf
1061
1062 bip_ipn_set64(mmie->sequence_number,
1063
1064 if (info->control.hw_key)
1065 return TX_CONTINUE;
1066
1067 bip_aad(skb, aad);
1068
1069 hdr = (struct ieee80211_hdr *)skb->da
1070 memcpy(nonce, hdr->addr2, ETH_ALEN);
1071 bip_ipn_swap(nonce + ETH_ALEN, mmie->
1072
1073 /* MIC = AES-GMAC(IGTK, AAD || Manage
1074 if (ieee80211_aes_gmac(key->u.aes_gma
1075 skb->data + 24
1076 return TX_DROP;
1077
1078 return TX_CONTINUE;
1079 }
1080
1081 ieee80211_rx_result
1082 ieee80211_crypto_aes_gmac_decrypt(struct ieee
1083 {
1084 struct sk_buff *skb = rx->skb;
1085 struct ieee80211_rx_status *status =
1086 struct ieee80211_key *key = rx->key;
1087 struct ieee80211_mmie_16 *mmie;
1088 u8 aad[GMAC_AAD_LEN], *mic, ipn[6], n
1089 struct ieee80211_hdr *hdr = (struct i
1090
1091 if (!ieee80211_is_mgmt(hdr->frame_con
1092 return RX_CONTINUE;
1093
1094 /* management frames are already line
1095
1096 if (skb->len < 24 + sizeof(*mmie))
1097 return RX_DROP_U_SHORT_GMAC;
1098
1099 mmie = (struct ieee80211_mmie_16 *)
1100 (skb->data + skb->len - sizeo
1101 if (mmie->element_id != WLAN_EID_MMIE
1102 mmie->length != sizeof(*mmie) - 2
1103 return RX_DROP_U_BAD_MMIE; /*
1104
1105 bip_ipn_swap(ipn, mmie->sequence_numb
1106
1107 if (memcmp(ipn, key->u.aes_gmac.rx_pn
1108 key->u.aes_gmac.replays++;
1109 return RX_DROP_U_REPLAY;
1110 }
1111
1112 if (!(status->flag & RX_FLAG_DECRYPTE
1113 /* hardware didn't decrypt/ve
1114 bip_aad(skb, aad);
1115
1116 memcpy(nonce, hdr->addr2, ETH
1117 memcpy(nonce + ETH_ALEN, ipn,
1118
1119 mic = kmalloc(GMAC_MIC_LEN, G
1120 if (!mic)
1121 return RX_DROP_U_OOM;
1122 if (ieee80211_aes_gmac(key->u
1123 skb->d
1124 mic) <
1125 crypto_memneq(mic, mmie->
1126 key->u.aes_gmac.icver
1127 kfree(mic);
1128 return RX_DROP_U_MIC_
1129 }
1130 kfree(mic);
1131 }
1132
1133 memcpy(key->u.aes_gmac.rx_pn, ipn, 6)
1134
1135 /* Remove MMIE */
1136 skb_trim(skb, skb->len - sizeof(*mmie
1137
1138 return RX_CONTINUE;
1139 }
1140
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