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10#include <linux/netdevice.h>
11#include <linux/types.h>
12#include <linux/skbuff.h>
13#include <linux/compiler.h>
14#include <linux/ieee80211.h>
15#include <linux/gfp.h>
16#include <asm/unaligned.h>
17#include <net/mac80211.h>
18#include <crypto/aes.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
29ieee80211_tx_result
30ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
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 = IEEE80211_SKB_CB(skb);
38 int tail;
39
40 hdr = (struct ieee80211_hdr *)skb->data;
41 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
42 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
43 return TX_CONTINUE;
44
45 hdrlen = ieee80211_hdrlen(hdr->frame_control);
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_TX_INTFL_TKIP_MIC_FAILURE)) {
53
54 info->control.hw_key = NULL;
55 }
56
57 if (info->control.hw_key &&
58 (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
59 tx->local->ops->set_frag_threshold) &&
60 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
61
62 return TX_CONTINUE;
63 }
64
65 tail = MICHAEL_MIC_LEN;
66 if (!info->control.hw_key)
67 tail += IEEE80211_TKIP_ICV_LEN;
68
69 if (WARN(skb_tailroom(skb) < tail ||
70 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN,
71 "mmic: not enough head/tail (%d/%d,%d/%d)\n",
72 skb_headroom(skb), IEEE80211_TKIP_IV_LEN,
73 skb_tailroom(skb), tail))
74 return TX_DROP;
75
76 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
77 mic = skb_put(skb, MICHAEL_MIC_LEN);
78 michael_mic(key, hdr, data, data_len, mic);
79 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
80 mic[0]++;
81
82 return TX_CONTINUE;
83}
84
85
86ieee80211_rx_result
87ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
88{
89 u8 *data, *key = NULL;
90 size_t data_len;
91 unsigned int hdrlen;
92 u8 mic[MICHAEL_MIC_LEN];
93 struct sk_buff *skb = rx->skb;
94 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
95 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
96
97
98
99
100
101 if (!ieee80211_is_data_present(hdr->frame_control))
102 return RX_CONTINUE;
103
104
105
106
107
108
109
110 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
111 if (status->flag & RX_FLAG_MMIC_ERROR)
112 goto mic_fail_no_key;
113
114 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
115 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
116 goto update_iv;
117
118 return RX_CONTINUE;
119 }
120
121
122
123
124
125
126 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
127 !(status->flag & RX_FLAG_DECRYPTED))
128 return RX_CONTINUE;
129
130 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
131
132
133
134
135
136
137 return RX_DROP_UNUSABLE;
138 }
139
140 if (status->flag & RX_FLAG_MMIC_ERROR)
141 goto mic_fail;
142
143 hdrlen = ieee80211_hdrlen(hdr->frame_control);
144 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
145 return RX_DROP_UNUSABLE;
146
147 if (skb_linearize(rx->skb))
148 return RX_DROP_UNUSABLE;
149 hdr = (void *)skb->data;
150
151 data = skb->data + hdrlen;
152 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
153 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
154 michael_mic(key, hdr, data, data_len, mic);
155 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0)
156 goto mic_fail;
157
158
159 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
160
161update_iv:
162
163 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32;
164 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16;
165
166 return RX_CONTINUE;
167
168mic_fail:
169 rx->key->u.tkip.mic_failures++;
170
171mic_fail_no_key:
172
173
174
175
176
177 mac80211_ev_michael_mic_failure(rx->sdata,
178 rx->key ? rx->key->conf.keyidx : -1,
179 (void *) skb->data, NULL, GFP_ATOMIC);
180 return RX_DROP_UNUSABLE;
181}
182
183
184static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
185{
186 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
187 struct ieee80211_key *key = tx->key;
188 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
189 unsigned int hdrlen;
190 int len, tail;
191 u8 *pos;
192
193 if (info->control.hw_key &&
194 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
195 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
196
197 return 0;
198 }
199
200 hdrlen = ieee80211_hdrlen(hdr->frame_control);
201 len = skb->len - hdrlen;
202
203 if (info->control.hw_key)
204 tail = 0;
205 else
206 tail = IEEE80211_TKIP_ICV_LEN;
207
208 if (WARN_ON(skb_tailroom(skb) < tail ||
209 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
210 return -1;
211
212 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
213 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
214 pos += hdrlen;
215
216
217 if (info->control.hw_key &&
218 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
219 return 0;
220
221
222 spin_lock(&key->u.tkip.txlock);
223 key->u.tkip.tx.iv16++;
224 if (key->u.tkip.tx.iv16 == 0)
225 key->u.tkip.tx.iv32++;
226 pos = ieee80211_tkip_add_iv(pos, key);
227 spin_unlock(&key->u.tkip.txlock);
228
229
230 if (info->control.hw_key)
231 return 0;
232
233
234 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
235
236 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
237 key, skb, pos, len);
238}
239
240
241ieee80211_tx_result
242ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
243{
244 struct sk_buff *skb;
245
246 ieee80211_tx_set_protected(tx);
247
248 skb_queue_walk(&tx->skbs, skb) {
249 if (tkip_encrypt_skb(tx, skb) < 0)
250 return TX_DROP;
251 }
252
253 return TX_CONTINUE;
254}
255
256
257ieee80211_rx_result
258ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
259{
260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
261 int hdrlen, res, hwaccel = 0;
262 struct ieee80211_key *key = rx->key;
263 struct sk_buff *skb = rx->skb;
264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
265
266 hdrlen = ieee80211_hdrlen(hdr->frame_control);
267
268 if (!ieee80211_is_data(hdr->frame_control))
269 return RX_CONTINUE;
270
271 if (!rx->sta || skb->len - hdrlen < 12)
272 return RX_DROP_UNUSABLE;
273
274
275 if (skb_linearize(rx->skb))
276 return RX_DROP_UNUSABLE;
277 hdr = (void *)skb->data;
278
279
280
281
282
283
284 if (status->flag & RX_FLAG_DECRYPTED)
285 hwaccel = 1;
286
287 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
288 key, skb->data + hdrlen,
289 skb->len - hdrlen, rx->sta->sta.addr,
290 hdr->addr1, hwaccel, rx->security_idx,
291 &rx->tkip_iv32,
292 &rx->tkip_iv16);
293 if (res != TKIP_DECRYPT_OK)
294 return RX_DROP_UNUSABLE;
295
296
297 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
298
299
300 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
301 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
302
303 return RX_CONTINUE;
304}
305
306
307static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
308{
309 __le16 mask_fc;
310 int a4_included, mgmt;
311 u8 qos_tid;
312 u16 len_a;
313 unsigned int hdrlen;
314 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
315
316
317
318
319
320 mgmt = ieee80211_is_mgmt(hdr->frame_control);
321 mask_fc = hdr->frame_control;
322 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
323 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
324 if (!mgmt)
325 mask_fc &= ~cpu_to_le16(0x0070);
326 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
327
328 hdrlen = ieee80211_hdrlen(hdr->frame_control);
329 len_a = hdrlen - 2;
330 a4_included = ieee80211_has_a4(hdr->frame_control);
331
332 if (ieee80211_is_data_qos(hdr->frame_control))
333 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
334 else
335 qos_tid = 0;
336
337
338
339
340
341
342
343
344 b_0[0] = 0x1;
345
346
347
348
349 b_0[1] = qos_tid | (mgmt << 4);
350 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
351 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
352
353
354
355 put_unaligned_be16(len_a, &aad[0]);
356 put_unaligned(mask_fc, (__le16 *)&aad[2]);
357 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
358
359
360 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
361 aad[23] = 0;
362
363 if (a4_included) {
364 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
365 aad[30] = qos_tid;
366 aad[31] = 0;
367 } else {
368 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
369 aad[24] = qos_tid;
370 }
371}
372
373
374static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
375{
376 hdr[0] = pn[5];
377 hdr[1] = pn[4];
378 hdr[2] = 0;
379 hdr[3] = 0x20 | (key_id << 6);
380 hdr[4] = pn[3];
381 hdr[5] = pn[2];
382 hdr[6] = pn[1];
383 hdr[7] = pn[0];
384}
385
386
387static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
388{
389 pn[0] = hdr[7];
390 pn[1] = hdr[6];
391 pn[2] = hdr[5];
392 pn[3] = hdr[4];
393 pn[4] = hdr[1];
394 pn[5] = hdr[0];
395}
396
397
398static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
399 unsigned int mic_len)
400{
401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
402 struct ieee80211_key *key = tx->key;
403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
404 int hdrlen, len, tail;
405 u8 *pos;
406 u8 pn[6];
407 u64 pn64;
408 u8 aad[2 * AES_BLOCK_SIZE];
409 u8 b_0[AES_BLOCK_SIZE];
410
411 if (info->control.hw_key &&
412 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
413 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
414 !((info->control.hw_key->flags &
415 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
416 ieee80211_is_mgmt(hdr->frame_control))) {
417
418
419
420
421 return 0;
422 }
423
424 hdrlen = ieee80211_hdrlen(hdr->frame_control);
425 len = skb->len - hdrlen;
426
427 if (info->control.hw_key)
428 tail = 0;
429 else
430 tail = mic_len;
431
432 if (WARN_ON(skb_tailroom(skb) < tail ||
433 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
434 return -1;
435
436 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
437 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
438
439
440 if (info->control.hw_key &&
441 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
442 return 0;
443
444 hdr = (struct ieee80211_hdr *) pos;
445 pos += hdrlen;
446
447 pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn);
448
449 pn[5] = pn64;
450 pn[4] = pn64 >> 8;
451 pn[3] = pn64 >> 16;
452 pn[2] = pn64 >> 24;
453 pn[1] = pn64 >> 32;
454 pn[0] = pn64 >> 40;
455
456 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
457
458
459 if (info->control.hw_key)
460 return 0;
461
462 pos += IEEE80211_CCMP_HDR_LEN;
463 ccmp_special_blocks(skb, pn, b_0, aad);
464 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
465 skb_put(skb, mic_len), mic_len);
466
467 return 0;
468}
469
470
471ieee80211_tx_result
472ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
473 unsigned int mic_len)
474{
475 struct sk_buff *skb;
476
477 ieee80211_tx_set_protected(tx);
478
479 skb_queue_walk(&tx->skbs, skb) {
480 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
481 return TX_DROP;
482 }
483
484 return TX_CONTINUE;
485}
486
487
488ieee80211_rx_result
489ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
490 unsigned int mic_len)
491{
492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
493 int hdrlen;
494 struct ieee80211_key *key = rx->key;
495 struct sk_buff *skb = rx->skb;
496 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
497 u8 pn[IEEE80211_CCMP_PN_LEN];
498 int data_len;
499 int queue;
500
501 hdrlen = ieee80211_hdrlen(hdr->frame_control);
502
503 if (!ieee80211_is_data(hdr->frame_control) &&
504 !ieee80211_is_robust_mgmt_frame(skb))
505 return RX_CONTINUE;
506
507 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
508 if (!rx->sta || data_len < 0)
509 return RX_DROP_UNUSABLE;
510
511 if (status->flag & RX_FLAG_DECRYPTED) {
512 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
513 return RX_DROP_UNUSABLE;
514 } else {
515 if (skb_linearize(rx->skb))
516 return RX_DROP_UNUSABLE;
517 }
518
519 ccmp_hdr2pn(pn, skb->data + hdrlen);
520
521 queue = rx->security_idx;
522
523 if (memcmp(pn, key->u.ccmp.rx_pn[queue], IEEE80211_CCMP_PN_LEN) <= 0) {
524 key->u.ccmp.replays++;
525 return RX_DROP_UNUSABLE;
526 }
527
528 if (!(status->flag & RX_FLAG_DECRYPTED)) {
529 u8 aad[2 * AES_BLOCK_SIZE];
530 u8 b_0[AES_BLOCK_SIZE];
531
532 ccmp_special_blocks(skb, pn, b_0, aad);
533
534 if (ieee80211_aes_ccm_decrypt(
535 key->u.ccmp.tfm, b_0, aad,
536 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
537 data_len,
538 skb->data + skb->len - mic_len, mic_len))
539 return RX_DROP_UNUSABLE;
540 }
541
542 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
543
544
545 if (pskb_trim(skb, skb->len - mic_len))
546 return RX_DROP_UNUSABLE;
547 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
548 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
549
550 return RX_CONTINUE;
551}
552
553static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
554{
555 __le16 mask_fc;
556 u8 qos_tid;
557 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
558
559 memcpy(j_0, hdr->addr2, ETH_ALEN);
560 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
561 j_0[13] = 0;
562 j_0[14] = 0;
563 j_0[AES_BLOCK_SIZE - 1] = 0x01;
564
565
566
567
568 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
569
570
571
572 mask_fc = hdr->frame_control;
573 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
574 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
575 if (!ieee80211_is_mgmt(hdr->frame_control))
576 mask_fc &= ~cpu_to_le16(0x0070);
577 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
578
579 put_unaligned(mask_fc, (__le16 *)&aad[2]);
580 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
581
582
583 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
584 aad[23] = 0;
585
586 if (ieee80211_is_data_qos(hdr->frame_control))
587 qos_tid = *ieee80211_get_qos_ctl(hdr) &
588 IEEE80211_QOS_CTL_TID_MASK;
589 else
590 qos_tid = 0;
591
592 if (ieee80211_has_a4(hdr->frame_control)) {
593 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
594 aad[30] = qos_tid;
595 aad[31] = 0;
596 } else {
597 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
598 aad[24] = qos_tid;
599 }
600}
601
602static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
603{
604 hdr[0] = pn[5];
605 hdr[1] = pn[4];
606 hdr[2] = 0;
607 hdr[3] = 0x20 | (key_id << 6);
608 hdr[4] = pn[3];
609 hdr[5] = pn[2];
610 hdr[6] = pn[1];
611 hdr[7] = pn[0];
612}
613
614static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
615{
616 pn[0] = hdr[7];
617 pn[1] = hdr[6];
618 pn[2] = hdr[5];
619 pn[3] = hdr[4];
620 pn[4] = hdr[1];
621 pn[5] = hdr[0];
622}
623
624static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
625{
626 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
627 struct ieee80211_key *key = tx->key;
628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
629 int hdrlen, len, tail;
630 u8 *pos;
631 u8 pn[6];
632 u64 pn64;
633 u8 aad[2 * AES_BLOCK_SIZE];
634 u8 j_0[AES_BLOCK_SIZE];
635
636 if (info->control.hw_key &&
637 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
638 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
639 !((info->control.hw_key->flags &
640 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
641 ieee80211_is_mgmt(hdr->frame_control))) {
642
643
644
645 return 0;
646 }
647
648 hdrlen = ieee80211_hdrlen(hdr->frame_control);
649 len = skb->len - hdrlen;
650
651 if (info->control.hw_key)
652 tail = 0;
653 else
654 tail = IEEE80211_GCMP_MIC_LEN;
655
656 if (WARN_ON(skb_tailroom(skb) < tail ||
657 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
658 return -1;
659
660 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
661 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
662 skb_set_network_header(skb, skb_network_offset(skb) +
663 IEEE80211_GCMP_HDR_LEN);
664
665
666 if (info->control.hw_key &&
667 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
668 return 0;
669
670 hdr = (struct ieee80211_hdr *)pos;
671 pos += hdrlen;
672
673 pn64 = atomic64_inc_return(&key->u.gcmp.tx_pn);
674
675 pn[5] = pn64;
676 pn[4] = pn64 >> 8;
677 pn[3] = pn64 >> 16;
678 pn[2] = pn64 >> 24;
679 pn[1] = pn64 >> 32;
680 pn[0] = pn64 >> 40;
681
682 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
683
684
685 if (info->control.hw_key)
686 return 0;
687
688 pos += IEEE80211_GCMP_HDR_LEN;
689 gcmp_special_blocks(skb, pn, j_0, aad);
690 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
691 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
692
693 return 0;
694}
695
696ieee80211_tx_result
697ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
698{
699 struct sk_buff *skb;
700
701 ieee80211_tx_set_protected(tx);
702
703 skb_queue_walk(&tx->skbs, skb) {
704 if (gcmp_encrypt_skb(tx, skb) < 0)
705 return TX_DROP;
706 }
707
708 return TX_CONTINUE;
709}
710
711ieee80211_rx_result
712ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
713{
714 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
715 int hdrlen;
716 struct ieee80211_key *key = rx->key;
717 struct sk_buff *skb = rx->skb;
718 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
719 u8 pn[IEEE80211_GCMP_PN_LEN];
720 int data_len;
721 int queue;
722
723 hdrlen = ieee80211_hdrlen(hdr->frame_control);
724
725 if (!ieee80211_is_data(hdr->frame_control) &&
726 !ieee80211_is_robust_mgmt_frame(skb))
727 return RX_CONTINUE;
728
729 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN -
730 IEEE80211_GCMP_MIC_LEN;
731 if (!rx->sta || data_len < 0)
732 return RX_DROP_UNUSABLE;
733
734 if (status->flag & RX_FLAG_DECRYPTED) {
735 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
736 return RX_DROP_UNUSABLE;
737 } else {
738 if (skb_linearize(rx->skb))
739 return RX_DROP_UNUSABLE;
740 }
741
742 gcmp_hdr2pn(pn, skb->data + hdrlen);
743
744 queue = rx->security_idx;
745
746 if (memcmp(pn, key->u.gcmp.rx_pn[queue], IEEE80211_GCMP_PN_LEN) <= 0) {
747 key->u.gcmp.replays++;
748 return RX_DROP_UNUSABLE;
749 }
750
751 if (!(status->flag & RX_FLAG_DECRYPTED)) {
752 u8 aad[2 * AES_BLOCK_SIZE];
753 u8 j_0[AES_BLOCK_SIZE];
754
755 gcmp_special_blocks(skb, pn, j_0, aad);
756
757 if (ieee80211_aes_gcm_decrypt(
758 key->u.gcmp.tfm, j_0, aad,
759 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
760 data_len,
761 skb->data + skb->len - IEEE80211_GCMP_MIC_LEN))
762 return RX_DROP_UNUSABLE;
763 }
764
765 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
766
767
768 if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN))
769 return RX_DROP_UNUSABLE;
770 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
771 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
772
773 return RX_CONTINUE;
774}
775
776static ieee80211_tx_result
777ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
778 struct sk_buff *skb)
779{
780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
781 struct ieee80211_key *key = tx->key;
782 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
783 int hdrlen;
784 u8 *pos, iv_len = key->conf.iv_len;
785
786 if (info->control.hw_key &&
787 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
788
789 return TX_CONTINUE;
790 }
791
792 if (unlikely(skb_headroom(skb) < iv_len &&
793 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
794 return TX_DROP;
795
796 hdrlen = ieee80211_hdrlen(hdr->frame_control);
797
798 pos = skb_push(skb, iv_len);
799 memmove(pos, pos + iv_len, hdrlen);
800
801 return TX_CONTINUE;
802}
803
804static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
805{
806 int i;
807
808
809 for (i = len - 1; i >= 0; i--) {
810 if (pn1[i] < pn2[i])
811 return -1;
812 else if (pn1[i] > pn2[i])
813 return 1;
814 }
815
816 return 0;
817}
818
819static ieee80211_rx_result
820ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
821{
822 struct ieee80211_key *key = rx->key;
823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
824 const struct ieee80211_cipher_scheme *cs = NULL;
825 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
826 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
827 int data_len;
828 u8 *rx_pn;
829 u8 *skb_pn;
830 u8 qos_tid;
831
832 if (!rx->sta || !rx->sta->cipher_scheme ||
833 !(status->flag & RX_FLAG_DECRYPTED))
834 return RX_DROP_UNUSABLE;
835
836 if (!ieee80211_is_data(hdr->frame_control))
837 return RX_CONTINUE;
838
839 cs = rx->sta->cipher_scheme;
840
841 data_len = rx->skb->len - hdrlen - cs->hdr_len;
842
843 if (data_len < 0)
844 return RX_DROP_UNUSABLE;
845
846 if (ieee80211_is_data_qos(hdr->frame_control))
847 qos_tid = *ieee80211_get_qos_ctl(hdr) &
848 IEEE80211_QOS_CTL_TID_MASK;
849 else
850 qos_tid = 0;
851
852 if (skb_linearize(rx->skb))
853 return RX_DROP_UNUSABLE;
854
855 hdr = (struct ieee80211_hdr *)rx->skb->data;
856
857 rx_pn = key->u.gen.rx_pn[qos_tid];
858 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
859
860 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
861 return RX_DROP_UNUSABLE;
862
863 memcpy(rx_pn, skb_pn, cs->pn_len);
864
865
866 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
867 return RX_DROP_UNUSABLE;
868
869 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
870 skb_pull(rx->skb, cs->hdr_len);
871
872 return RX_CONTINUE;
873}
874
875static void bip_aad(struct sk_buff *skb, u8 *aad)
876{
877 __le16 mask_fc;
878 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
879
880
881
882
883
884 mask_fc = hdr->frame_control;
885 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
886 IEEE80211_FCTL_MOREDATA);
887 put_unaligned(mask_fc, (__le16 *) &aad[0]);
888
889 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
890}
891
892
893static inline void bip_ipn_set64(u8 *d, u64 pn)
894{
895 *d++ = pn;
896 *d++ = pn >> 8;
897 *d++ = pn >> 16;
898 *d++ = pn >> 24;
899 *d++ = pn >> 32;
900 *d = pn >> 40;
901}
902
903static inline void bip_ipn_swap(u8 *d, const u8 *s)
904{
905 *d++ = s[5];
906 *d++ = s[4];
907 *d++ = s[3];
908 *d++ = s[2];
909 *d++ = s[1];
910 *d = s[0];
911}
912
913
914ieee80211_tx_result
915ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
916{
917 struct sk_buff *skb;
918 struct ieee80211_tx_info *info;
919 struct ieee80211_key *key = tx->key;
920 struct ieee80211_mmie *mmie;
921 u8 aad[20];
922 u64 pn64;
923
924 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
925 return TX_DROP;
926
927 skb = skb_peek(&tx->skbs);
928
929 info = IEEE80211_SKB_CB(skb);
930
931 if (info->control.hw_key)
932 return TX_CONTINUE;
933
934 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
935 return TX_DROP;
936
937 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
938 mmie->element_id = WLAN_EID_MMIE;
939 mmie->length = sizeof(*mmie) - 2;
940 mmie->key_id = cpu_to_le16(key->conf.keyidx);
941
942
943 pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn);
944
945 bip_ipn_set64(mmie->sequence_number, pn64);
946
947 bip_aad(skb, aad);
948
949
950
951
952 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
953 skb->data + 24, skb->len - 24, mmie->mic);
954
955 return TX_CONTINUE;
956}
957
958ieee80211_tx_result
959ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
960{
961 struct sk_buff *skb;
962 struct ieee80211_tx_info *info;
963 struct ieee80211_key *key = tx->key;
964 struct ieee80211_mmie_16 *mmie;
965 u8 aad[20];
966 u64 pn64;
967
968 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
969 return TX_DROP;
970
971 skb = skb_peek(&tx->skbs);
972
973 info = IEEE80211_SKB_CB(skb);
974
975 if (info->control.hw_key)
976 return TX_CONTINUE;
977
978 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
979 return TX_DROP;
980
981 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
982 mmie->element_id = WLAN_EID_MMIE;
983 mmie->length = sizeof(*mmie) - 2;
984 mmie->key_id = cpu_to_le16(key->conf.keyidx);
985
986
987 pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn);
988
989 bip_ipn_set64(mmie->sequence_number, pn64);
990
991 bip_aad(skb, aad);
992
993
994
995 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
996 skb->data + 24, skb->len - 24, mmie->mic);
997
998 return TX_CONTINUE;
999}
1000
1001ieee80211_rx_result
1002ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1003{
1004 struct sk_buff *skb = rx->skb;
1005 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1006 struct ieee80211_key *key = rx->key;
1007 struct ieee80211_mmie *mmie;
1008 u8 aad[20], mic[8], ipn[6];
1009 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1010
1011 if (!ieee80211_is_mgmt(hdr->frame_control))
1012 return RX_CONTINUE;
1013
1014
1015
1016 if (skb->len < 24 + sizeof(*mmie))
1017 return RX_DROP_UNUSABLE;
1018
1019 mmie = (struct ieee80211_mmie *)
1020 (skb->data + skb->len - sizeof(*mmie));
1021 if (mmie->element_id != WLAN_EID_MMIE ||
1022 mmie->length != sizeof(*mmie) - 2)
1023 return RX_DROP_UNUSABLE;
1024
1025 bip_ipn_swap(ipn, mmie->sequence_number);
1026
1027 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1028 key->u.aes_cmac.replays++;
1029 return RX_DROP_UNUSABLE;
1030 }
1031
1032 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1033
1034 bip_aad(skb, aad);
1035 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1036 skb->data + 24, skb->len - 24, mic);
1037 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1038 key->u.aes_cmac.icverrors++;
1039 return RX_DROP_UNUSABLE;
1040 }
1041 }
1042
1043 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1044
1045
1046 skb_trim(skb, skb->len - sizeof(*mmie));
1047
1048 return RX_CONTINUE;
1049}
1050
1051ieee80211_rx_result
1052ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1053{
1054 struct sk_buff *skb = rx->skb;
1055 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1056 struct ieee80211_key *key = rx->key;
1057 struct ieee80211_mmie_16 *mmie;
1058 u8 aad[20], mic[16], ipn[6];
1059 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1060
1061 if (!ieee80211_is_mgmt(hdr->frame_control))
1062 return RX_CONTINUE;
1063
1064
1065
1066 if (skb->len < 24 + sizeof(*mmie))
1067 return RX_DROP_UNUSABLE;
1068
1069 mmie = (struct ieee80211_mmie_16 *)
1070 (skb->data + skb->len - sizeof(*mmie));
1071 if (mmie->element_id != WLAN_EID_MMIE ||
1072 mmie->length != sizeof(*mmie) - 2)
1073 return RX_DROP_UNUSABLE;
1074
1075 bip_ipn_swap(ipn, mmie->sequence_number);
1076
1077 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1078 key->u.aes_cmac.replays++;
1079 return RX_DROP_UNUSABLE;
1080 }
1081
1082 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1083
1084 bip_aad(skb, aad);
1085 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1086 skb->data + 24, skb->len - 24, mic);
1087 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1088 key->u.aes_cmac.icverrors++;
1089 return RX_DROP_UNUSABLE;
1090 }
1091 }
1092
1093 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1094
1095
1096 skb_trim(skb, skb->len - sizeof(*mmie));
1097
1098 return RX_CONTINUE;
1099}
1100
1101ieee80211_tx_result
1102ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1103{
1104 struct sk_buff *skb;
1105 struct ieee80211_tx_info *info;
1106 struct ieee80211_key *key = tx->key;
1107 struct ieee80211_mmie_16 *mmie;
1108 struct ieee80211_hdr *hdr;
1109 u8 aad[20];
1110 u64 pn64;
1111 u8 nonce[12];
1112
1113 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1114 return TX_DROP;
1115
1116 skb = skb_peek(&tx->skbs);
1117
1118 info = IEEE80211_SKB_CB(skb);
1119
1120 if (info->control.hw_key)
1121 return TX_CONTINUE;
1122
1123 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1124 return TX_DROP;
1125
1126 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1127 mmie->element_id = WLAN_EID_MMIE;
1128 mmie->length = sizeof(*mmie) - 2;
1129 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1130
1131
1132 pn64 = atomic64_inc_return(&key->u.aes_gmac.tx_pn);
1133
1134 bip_ipn_set64(mmie->sequence_number, pn64);
1135
1136 bip_aad(skb, aad);
1137
1138 hdr = (struct ieee80211_hdr *)skb->data;
1139 memcpy(nonce, hdr->addr2, ETH_ALEN);
1140 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1141
1142
1143 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1144 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1145 return TX_DROP;
1146
1147 return TX_CONTINUE;
1148}
1149
1150ieee80211_rx_result
1151ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1152{
1153 struct sk_buff *skb = rx->skb;
1154 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1155 struct ieee80211_key *key = rx->key;
1156 struct ieee80211_mmie_16 *mmie;
1157 u8 aad[20], mic[16], ipn[6], nonce[12];
1158 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1159
1160 if (!ieee80211_is_mgmt(hdr->frame_control))
1161 return RX_CONTINUE;
1162
1163
1164
1165 if (skb->len < 24 + sizeof(*mmie))
1166 return RX_DROP_UNUSABLE;
1167
1168 mmie = (struct ieee80211_mmie_16 *)
1169 (skb->data + skb->len - sizeof(*mmie));
1170 if (mmie->element_id != WLAN_EID_MMIE ||
1171 mmie->length != sizeof(*mmie) - 2)
1172 return RX_DROP_UNUSABLE;
1173
1174 bip_ipn_swap(ipn, mmie->sequence_number);
1175
1176 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1177 key->u.aes_gmac.replays++;
1178 return RX_DROP_UNUSABLE;
1179 }
1180
1181 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1182
1183 bip_aad(skb, aad);
1184
1185 memcpy(nonce, hdr->addr2, ETH_ALEN);
1186 memcpy(nonce + ETH_ALEN, ipn, 6);
1187
1188 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1189 skb->data + 24, skb->len - 24,
1190 mic) < 0 ||
1191 memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1192 key->u.aes_gmac.icverrors++;
1193 return RX_DROP_UNUSABLE;
1194 }
1195 }
1196
1197 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1198
1199
1200 skb_trim(skb, skb->len - sizeof(*mmie));
1201
1202 return RX_CONTINUE;
1203}
1204
1205ieee80211_tx_result
1206ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1207{
1208 struct sk_buff *skb;
1209 struct ieee80211_tx_info *info = NULL;
1210 ieee80211_tx_result res;
1211
1212 skb_queue_walk(&tx->skbs, skb) {
1213 info = IEEE80211_SKB_CB(skb);
1214
1215
1216 if (!info->control.hw_key)
1217 return TX_DROP;
1218
1219 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1220 res = ieee80211_crypto_cs_encrypt(tx, skb);
1221 if (res != TX_CONTINUE)
1222 return res;
1223 }
1224 }
1225
1226 ieee80211_tx_set_protected(tx);
1227
1228 return TX_CONTINUE;
1229}
1230
1231ieee80211_rx_result
1232ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1233{
1234 if (rx->sta && rx->sta->cipher_scheme)
1235 return ieee80211_crypto_cs_decrypt(rx);
1236
1237 return RX_DROP_UNUSABLE;
1238}
1239
