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bpf: export helper function flags and reject invalid ones
[linux-2.6/btrfs-unstable.git] / net / mac80211 / wpa.c
blobd824c38971ed53ff702669c9bce0f4a86495bdd0
1 /*
2 * Copyright 2002-2004, Instant802 Networks, Inc.
3 * Copyright 2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
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
29 ieee80211_tx_result
30 ieee80211_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 /* Need to use software crypto for the test */
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 /* hwaccel - with no need for SW-generated MMIC */
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
86 ieee80211_rx_result
87 ieee80211_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 * it makes no sense to check for MIC errors on anything other
99 * than data frames.
100 */
101 if (!ieee80211_is_data_present(hdr->frame_control))
102 return RX_CONTINUE;
103
104 /*
105 * No way to verify the MIC if the hardware stripped it or
106 * the IV with the key index. In this case we have solely rely
107 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
108 * MIC failure report.
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 * Some hardware seems to generate Michael MIC failure reports; even
123 * though, the frame was not encrypted with TKIP and therefore has no
124 * MIC. Ignore the flag them to avoid triggering countermeasures.
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 * APs with pairwise keys should never receive Michael MIC
133 * errors for non-zero keyidx because these are reserved for
134 * group keys and only the AP is sending real multicast
135 * frames in the BSS.
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 /* remove Michael MIC from payload */
159 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
160
161 update_iv:
162 /* update IV in key information to be able to detect replays */
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
168 mic_fail:
169 rx->key->u.tkip.mic_failures++;
170
171 mic_fail_no_key:
172 /*
173 * In some cases the key can be unset - e.g. a multicast packet, in
174 * a driver that supports HW encryption. Send up the key idx only if
175 * the key is set.
176 */
177 cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2,
178 is_multicast_ether_addr(hdr->addr1) ?
179 NL80211_KEYTYPE_GROUP :
180 NL80211_KEYTYPE_PAIRWISE,
181 rx->key ? rx->key->conf.keyidx : -1,
182 NULL, GFP_ATOMIC);
183 return RX_DROP_UNUSABLE;
184 }
185
186
187 static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
188 {
189 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
190 struct ieee80211_key *key = tx->key;
191 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
192 unsigned int hdrlen;
193 int len, tail;
194 u8 *pos;
195
196 if (info->control.hw_key &&
197 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
198 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
199 /* hwaccel - with no need for software-generated IV */
200 return 0;
201 }
202
203 hdrlen = ieee80211_hdrlen(hdr->frame_control);
204 len = skb->len - hdrlen;
205
206 if (info->control.hw_key)
207 tail = 0;
208 else
209 tail = IEEE80211_TKIP_ICV_LEN;
210
211 if (WARN_ON(skb_tailroom(skb) < tail ||
212 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
213 return -1;
214
215 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
216 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
217 pos += hdrlen;
218
219 /* the HW only needs room for the IV, but not the actual IV */
220 if (info->control.hw_key &&
221 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
222 return 0;
223
224 /* Increase IV for the frame */
225 spin_lock(&key->u.tkip.txlock);
226 key->u.tkip.tx.iv16++;
227 if (key->u.tkip.tx.iv16 == 0)
228 key->u.tkip.tx.iv32++;
229 pos = ieee80211_tkip_add_iv(pos, key);
230 spin_unlock(&key->u.tkip.txlock);
231
232 /* hwaccel - with software IV */
233 if (info->control.hw_key)
234 return 0;
235
236 /* Add room for ICV */
237 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
238
239 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
240 key, skb, pos, len);
241 }
242
243
244 ieee80211_tx_result
245 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
246 {
247 struct sk_buff *skb;
248
249 ieee80211_tx_set_protected(tx);
250
251 skb_queue_walk(&tx->skbs, skb) {
252 if (tkip_encrypt_skb(tx, skb) < 0)
253 return TX_DROP;
254 }
255
256 return TX_CONTINUE;
257 }
258
259
260 ieee80211_rx_result
261 ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
262 {
263 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
264 int hdrlen, res, hwaccel = 0;
265 struct ieee80211_key *key = rx->key;
266 struct sk_buff *skb = rx->skb;
267 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
268
269 hdrlen = ieee80211_hdrlen(hdr->frame_control);
270
271 if (!ieee80211_is_data(hdr->frame_control))
272 return RX_CONTINUE;
273
274 if (!rx->sta || skb->len - hdrlen < 12)
275 return RX_DROP_UNUSABLE;
276
277 /* it may be possible to optimize this a bit more */
278 if (skb_linearize(rx->skb))
279 return RX_DROP_UNUSABLE;
280 hdr = (void *)skb->data;
281
282 /*
283 * Let TKIP code verify IV, but skip decryption.
284 * In the case where hardware checks the IV as well,
285 * we don't even get here, see ieee80211_rx_h_decrypt()
286 */
287 if (status->flag & RX_FLAG_DECRYPTED)
288 hwaccel = 1;
289
290 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
291 key, skb->data + hdrlen,
292 skb->len - hdrlen, rx->sta->sta.addr,
293 hdr->addr1, hwaccel, rx->security_idx,
294 &rx->tkip_iv32,
295 &rx->tkip_iv16);
296 if (res != TKIP_DECRYPT_OK)
297 return RX_DROP_UNUSABLE;
298
299 /* Trim ICV */
300 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
301
302 /* Remove IV */
303 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
304 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
305
306 return RX_CONTINUE;
307 }
308
309
310 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
311 {
312 __le16 mask_fc;
313 int a4_included, mgmt;
314 u8 qos_tid;
315 u16 len_a;
316 unsigned int hdrlen;
317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
318
319 /*
320 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
321 * Retry, PwrMgt, MoreData; set Protected
322 */
323 mgmt = ieee80211_is_mgmt(hdr->frame_control);
324 mask_fc = hdr->frame_control;
325 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
326 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
327 if (!mgmt)
328 mask_fc &= ~cpu_to_le16(0x0070);
329 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
330
331 hdrlen = ieee80211_hdrlen(hdr->frame_control);
332 len_a = hdrlen - 2;
333 a4_included = ieee80211_has_a4(hdr->frame_control);
334
335 if (ieee80211_is_data_qos(hdr->frame_control))
336 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
337 else
338 qos_tid = 0;
339
340 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
341 * mode authentication are not allowed to collide, yet both are derived
342 * from this vector b_0. We only set L := 1 here to indicate that the
343 * data size can be represented in (L+1) bytes. The CCM layer will take
344 * care of storing the data length in the top (L+1) bytes and setting
345 * and clearing the other bits as is required to derive the two IVs.
346 */
347 b_0[0] = 0x1;
348
349 /* Nonce: Nonce Flags | A2 | PN
350 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
351 */
352 b_0[1] = qos_tid | (mgmt << 4);
353 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
354 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
355
356 /* AAD (extra authenticate-only data) / masked 802.11 header
357 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
358 put_unaligned_be16(len_a, &aad[0]);
359 put_unaligned(mask_fc, (__le16 *)&aad[2]);
360 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
361
362 /* Mask Seq#, leave Frag# */
363 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
364 aad[23] = 0;
365
366 if (a4_included) {
367 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
368 aad[30] = qos_tid;
369 aad[31] = 0;
370 } else {
371 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
372 aad[24] = qos_tid;
373 }
374 }
375
376
377 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
378 {
379 hdr[0] = pn[5];
380 hdr[1] = pn[4];
381 hdr[2] = 0;
382 hdr[3] = 0x20 | (key_id << 6);
383 hdr[4] = pn[3];
384 hdr[5] = pn[2];
385 hdr[6] = pn[1];
386 hdr[7] = pn[0];
387 }
388
389
390 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
391 {
392 pn[0] = hdr[7];
393 pn[1] = hdr[6];
394 pn[2] = hdr[5];
395 pn[3] = hdr[4];
396 pn[4] = hdr[1];
397 pn[5] = hdr[0];
398 }
399
400
401 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
402 unsigned int mic_len)
403 {
404 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
405 struct ieee80211_key *key = tx->key;
406 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
407 int hdrlen, len, tail;
408 u8 *pos;
409 u8 pn[6];
410 u64 pn64;
411 u8 aad[2 * AES_BLOCK_SIZE];
412 u8 b_0[AES_BLOCK_SIZE];
413
414 if (info->control.hw_key &&
415 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
416 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
417 !((info->control.hw_key->flags &
418 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
419 ieee80211_is_mgmt(hdr->frame_control))) {
420 /*
421 * hwaccel has no need for preallocated room for CCMP
422 * header or MIC fields
423 */
424 return 0;
425 }
426
427 hdrlen = ieee80211_hdrlen(hdr->frame_control);
428 len = skb->len - hdrlen;
429
430 if (info->control.hw_key)
431 tail = 0;
432 else
433 tail = mic_len;
434
435 if (WARN_ON(skb_tailroom(skb) < tail ||
436 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
437 return -1;
438
439 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
440 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
441
442 /* the HW only needs room for the IV, but not the actual IV */
443 if (info->control.hw_key &&
444 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
445 return 0;
446
447 hdr = (struct ieee80211_hdr *) pos;
448 pos += hdrlen;
449
450 pn64 = atomic64_inc_return(&key->conf.tx_pn);
451
452 pn[5] = pn64;
453 pn[4] = pn64 >> 8;
454 pn[3] = pn64 >> 16;
455 pn[2] = pn64 >> 24;
456 pn[1] = pn64 >> 32;
457 pn[0] = pn64 >> 40;
458
459 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
460
461 /* hwaccel - with software CCMP header */
462 if (info->control.hw_key)
463 return 0;
464
465 pos += IEEE80211_CCMP_HDR_LEN;
466 ccmp_special_blocks(skb, pn, b_0, aad);
467 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
468 skb_put(skb, mic_len), mic_len);
469
470 return 0;
471 }
472
473
474 ieee80211_tx_result
475 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
476 unsigned int mic_len)
477 {
478 struct sk_buff *skb;
479
480 ieee80211_tx_set_protected(tx);
481
482 skb_queue_walk(&tx->skbs, skb) {
483 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
484 return TX_DROP;
485 }
486
487 return TX_CONTINUE;
488 }
489
490
491 ieee80211_rx_result
492 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
493 unsigned int mic_len)
494 {
495 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
496 int hdrlen;
497 struct ieee80211_key *key = rx->key;
498 struct sk_buff *skb = rx->skb;
499 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
500 u8 pn[IEEE80211_CCMP_PN_LEN];
501 int data_len;
502 int queue;
503
504 hdrlen = ieee80211_hdrlen(hdr->frame_control);
505
506 if (!ieee80211_is_data(hdr->frame_control) &&
507 !ieee80211_is_robust_mgmt_frame(skb))
508 return RX_CONTINUE;
509
510 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
511 if (!rx->sta || data_len < 0)
512 return RX_DROP_UNUSABLE;
513
514 if (status->flag & RX_FLAG_DECRYPTED) {
515 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
516 return RX_DROP_UNUSABLE;
517 } else {
518 if (skb_linearize(rx->skb))
519 return RX_DROP_UNUSABLE;
520 }
521
522 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
523 ccmp_hdr2pn(pn, skb->data + hdrlen);
524
525 queue = rx->security_idx;
526
527 if (memcmp(pn, key->u.ccmp.rx_pn[queue],
528 IEEE80211_CCMP_PN_LEN) <= 0) {
529 key->u.ccmp.replays++;
530 return RX_DROP_UNUSABLE;
531 }
532
533 if (!(status->flag & RX_FLAG_DECRYPTED)) {
534 u8 aad[2 * AES_BLOCK_SIZE];
535 u8 b_0[AES_BLOCK_SIZE];
536 /* hardware didn't decrypt/verify MIC */
537 ccmp_special_blocks(skb, pn, b_0, aad);
538
539 if (ieee80211_aes_ccm_decrypt(
540 key->u.ccmp.tfm, b_0, aad,
541 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
542 data_len,
543 skb->data + skb->len - mic_len, mic_len))
544 return RX_DROP_UNUSABLE;
545 }
546
547 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
548 }
549
550 /* Remove CCMP header and MIC */
551 if (pskb_trim(skb, skb->len - mic_len))
552 return RX_DROP_UNUSABLE;
553 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
554 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
555
556 return RX_CONTINUE;
557 }
558
559 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
560 {
561 __le16 mask_fc;
562 u8 qos_tid;
563 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
564
565 memcpy(j_0, hdr->addr2, ETH_ALEN);
566 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
567 j_0[13] = 0;
568 j_0[14] = 0;
569 j_0[AES_BLOCK_SIZE - 1] = 0x01;
570
571 /* AAD (extra authenticate-only data) / masked 802.11 header
572 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
573 */
574 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
575 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
576 * Retry, PwrMgt, MoreData; set Protected
577 */
578 mask_fc = hdr->frame_control;
579 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
580 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
581 if (!ieee80211_is_mgmt(hdr->frame_control))
582 mask_fc &= ~cpu_to_le16(0x0070);
583 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
584
585 put_unaligned(mask_fc, (__le16 *)&aad[2]);
586 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
587
588 /* Mask Seq#, leave Frag# */
589 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
590 aad[23] = 0;
591
592 if (ieee80211_is_data_qos(hdr->frame_control))
593 qos_tid = *ieee80211_get_qos_ctl(hdr) &
594 IEEE80211_QOS_CTL_TID_MASK;
595 else
596 qos_tid = 0;
597
598 if (ieee80211_has_a4(hdr->frame_control)) {
599 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
600 aad[30] = qos_tid;
601 aad[31] = 0;
602 } else {
603 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
604 aad[24] = qos_tid;
605 }
606 }
607
608 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
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 u8 *hdr)
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_tx_data *tx, struct sk_buff *skb)
631 {
632 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
633 struct ieee80211_key *key = tx->key;
634 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
635 int hdrlen, len, tail;
636 u8 *pos;
637 u8 pn[6];
638 u64 pn64;
639 u8 aad[2 * AES_BLOCK_SIZE];
640 u8 j_0[AES_BLOCK_SIZE];
641
642 if (info->control.hw_key &&
643 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
644 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
645 !((info->control.hw_key->flags &
646 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
647 ieee80211_is_mgmt(hdr->frame_control))) {
648 /* hwaccel has no need for preallocated room for GCMP
649 * header or MIC fields
650 */
651 return 0;
652 }
653
654 hdrlen = ieee80211_hdrlen(hdr->frame_control);
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) < IEEE80211_GCMP_HDR_LEN))
664 return -1;
665
666 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
667 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
668 skb_set_network_header(skb, skb_network_offset(skb) +
669 IEEE80211_GCMP_HDR_LEN);
670
671 /* the HW only needs room for the IV, but not the actual IV */
672 if (info->control.hw_key &&
673 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
674 return 0;
675
676 hdr = (struct ieee80211_hdr *)pos;
677 pos += hdrlen;
678
679 pn64 = atomic64_inc_return(&key->conf.tx_pn);
680
681 pn[5] = pn64;
682 pn[4] = pn64 >> 8;
683 pn[3] = pn64 >> 16;
684 pn[2] = pn64 >> 24;
685 pn[1] = pn64 >> 32;
686 pn[0] = pn64 >> 40;
687
688 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
689
690 /* hwaccel - with software GCMP header */
691 if (info->control.hw_key)
692 return 0;
693
694 pos += IEEE80211_GCMP_HDR_LEN;
695 gcmp_special_blocks(skb, pn, j_0, aad);
696 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
697 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
698
699 return 0;
700 }
701
702 ieee80211_tx_result
703 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
704 {
705 struct sk_buff *skb;
706
707 ieee80211_tx_set_protected(tx);
708
709 skb_queue_walk(&tx->skbs, skb) {
710 if (gcmp_encrypt_skb(tx, skb) < 0)
711 return TX_DROP;
712 }
713
714 return TX_CONTINUE;
715 }
716
717 ieee80211_rx_result
718 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
719 {
720 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
721 int hdrlen;
722 struct ieee80211_key *key = rx->key;
723 struct sk_buff *skb = rx->skb;
724 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
725 u8 pn[IEEE80211_GCMP_PN_LEN];
726 int data_len;
727 int queue;
728
729 hdrlen = ieee80211_hdrlen(hdr->frame_control);
730
731 if (!ieee80211_is_data(hdr->frame_control) &&
732 !ieee80211_is_robust_mgmt_frame(skb))
733 return RX_CONTINUE;
734
735 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN -
736 IEEE80211_GCMP_MIC_LEN;
737 if (!rx->sta || data_len < 0)
738 return RX_DROP_UNUSABLE;
739
740 if (status->flag & RX_FLAG_DECRYPTED) {
741 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
742 return RX_DROP_UNUSABLE;
743 } else {
744 if (skb_linearize(rx->skb))
745 return RX_DROP_UNUSABLE;
746 }
747
748 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
749 gcmp_hdr2pn(pn, skb->data + hdrlen);
750
751 queue = rx->security_idx;
752
753 if (memcmp(pn, key->u.gcmp.rx_pn[queue],
754 IEEE80211_GCMP_PN_LEN) <= 0) {
755 key->u.gcmp.replays++;
756 return RX_DROP_UNUSABLE;
757 }
758
759 if (!(status->flag & RX_FLAG_DECRYPTED)) {
760 u8 aad[2 * AES_BLOCK_SIZE];
761 u8 j_0[AES_BLOCK_SIZE];
762 /* hardware didn't decrypt/verify MIC */
763 gcmp_special_blocks(skb, pn, j_0, aad);
764
765 if (ieee80211_aes_gcm_decrypt(
766 key->u.gcmp.tfm, j_0, aad,
767 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
768 data_len,
769 skb->data + skb->len -
770 IEEE80211_GCMP_MIC_LEN))
771 return RX_DROP_UNUSABLE;
772 }
773
774 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
775 }
776
777 /* Remove GCMP header and MIC */
778 if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN))
779 return RX_DROP_UNUSABLE;
780 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
781 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
782
783 return RX_CONTINUE;
784 }
785
786 static ieee80211_tx_result
787 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
788 struct sk_buff *skb)
789 {
790 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
791 struct ieee80211_key *key = tx->key;
792 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
793 int hdrlen;
794 u8 *pos, iv_len = key->conf.iv_len;
795
796 if (info->control.hw_key &&
797 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
798 /* hwaccel has no need for preallocated head room */
799 return TX_CONTINUE;
800 }
801
802 if (unlikely(skb_headroom(skb) < iv_len &&
803 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
804 return TX_DROP;
805
806 hdrlen = ieee80211_hdrlen(hdr->frame_control);
807
808 pos = skb_push(skb, iv_len);
809 memmove(pos, pos + iv_len, hdrlen);
810
811 return TX_CONTINUE;
812 }
813
814 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
815 {
816 int i;
817
818 /* pn is little endian */
819 for (i = len - 1; i >= 0; i--) {
820 if (pn1[i] < pn2[i])
821 return -1;
822 else if (pn1[i] > pn2[i])
823 return 1;
824 }
825
826 return 0;
827 }
828
829 static ieee80211_rx_result
830 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
831 {
832 struct ieee80211_key *key = rx->key;
833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
834 const struct ieee80211_cipher_scheme *cs = NULL;
835 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
836 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
837 int data_len;
838 u8 *rx_pn;
839 u8 *skb_pn;
840 u8 qos_tid;
841
842 if (!rx->sta || !rx->sta->cipher_scheme ||
843 !(status->flag & RX_FLAG_DECRYPTED))
844 return RX_DROP_UNUSABLE;
845
846 if (!ieee80211_is_data(hdr->frame_control))
847 return RX_CONTINUE;
848
849 cs = rx->sta->cipher_scheme;
850
851 data_len = rx->skb->len - hdrlen - cs->hdr_len;
852
853 if (data_len < 0)
854 return RX_DROP_UNUSABLE;
855
856 if (ieee80211_is_data_qos(hdr->frame_control))
857 qos_tid = *ieee80211_get_qos_ctl(hdr) &
858 IEEE80211_QOS_CTL_TID_MASK;
859 else
860 qos_tid = 0;
861
862 if (skb_linearize(rx->skb))
863 return RX_DROP_UNUSABLE;
864
865 hdr = (struct ieee80211_hdr *)rx->skb->data;
866
867 rx_pn = key->u.gen.rx_pn[qos_tid];
868 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
869
870 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
871 return RX_DROP_UNUSABLE;
872
873 memcpy(rx_pn, skb_pn, cs->pn_len);
874
875 /* remove security header and MIC */
876 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
877 return RX_DROP_UNUSABLE;
878
879 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
880 skb_pull(rx->skb, cs->hdr_len);
881
882 return RX_CONTINUE;
883 }
884
885 static void bip_aad(struct sk_buff *skb, u8 *aad)
886 {
887 __le16 mask_fc;
888 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
889
890 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
891
892 /* FC type/subtype */
893 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
894 mask_fc = hdr->frame_control;
895 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
896 IEEE80211_FCTL_MOREDATA);
897 put_unaligned(mask_fc, (__le16 *) &aad[0]);
898 /* A1 || A2 || A3 */
899 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
900 }
901
902
903 static inline void bip_ipn_set64(u8 *d, u64 pn)
904 {
905 *d++ = pn;
906 *d++ = pn >> 8;
907 *d++ = pn >> 16;
908 *d++ = pn >> 24;
909 *d++ = pn >> 32;
910 *d = pn >> 40;
911 }
912
913 static inline void bip_ipn_swap(u8 *d, const u8 *s)
914 {
915 *d++ = s[5];
916 *d++ = s[4];
917 *d++ = s[3];
918 *d++ = s[2];
919 *d++ = s[1];
920 *d = s[0];
921 }
922
923
924 ieee80211_tx_result
925 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
926 {
927 struct sk_buff *skb;
928 struct ieee80211_tx_info *info;
929 struct ieee80211_key *key = tx->key;
930 struct ieee80211_mmie *mmie;
931 u8 aad[20];
932 u64 pn64;
933
934 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
935 return TX_DROP;
936
937 skb = skb_peek(&tx->skbs);
938
939 info = IEEE80211_SKB_CB(skb);
940
941 if (info->control.hw_key)
942 return TX_CONTINUE;
943
944 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
945 return TX_DROP;
946
947 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
948 mmie->element_id = WLAN_EID_MMIE;
949 mmie->length = sizeof(*mmie) - 2;
950 mmie->key_id = cpu_to_le16(key->conf.keyidx);
951
952 /* PN = PN + 1 */
953 pn64 = atomic64_inc_return(&key->conf.tx_pn);
954
955 bip_ipn_set64(mmie->sequence_number, pn64);
956
957 bip_aad(skb, aad);
958
959 /*
960 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
961 */
962 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
963 skb->data + 24, skb->len - 24, mmie->mic);
964
965 return TX_CONTINUE;
966 }
967
968 ieee80211_tx_result
969 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
970 {
971 struct sk_buff *skb;
972 struct ieee80211_tx_info *info;
973 struct ieee80211_key *key = tx->key;
974 struct ieee80211_mmie_16 *mmie;
975 u8 aad[20];
976 u64 pn64;
977
978 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
979 return TX_DROP;
980
981 skb = skb_peek(&tx->skbs);
982
983 info = IEEE80211_SKB_CB(skb);
984
985 if (info->control.hw_key)
986 return TX_CONTINUE;
987
988 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
989 return TX_DROP;
990
991 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
992 mmie->element_id = WLAN_EID_MMIE;
993 mmie->length = sizeof(*mmie) - 2;
994 mmie->key_id = cpu_to_le16(key->conf.keyidx);
995
996 /* PN = PN + 1 */
997 pn64 = atomic64_inc_return(&key->conf.tx_pn);
998
999 bip_ipn_set64(mmie->sequence_number, pn64);
1000
1001 bip_aad(skb, aad);
1002
1003 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1004 */
1005 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1006 skb->data + 24, skb->len - 24, mmie->mic);
1007
1008 return TX_CONTINUE;
1009 }
1010
1011 ieee80211_rx_result
1012 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1013 {
1014 struct sk_buff *skb = rx->skb;
1015 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1016 struct ieee80211_key *key = rx->key;
1017 struct ieee80211_mmie *mmie;
1018 u8 aad[20], mic[8], ipn[6];
1019 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1020
1021 if (!ieee80211_is_mgmt(hdr->frame_control))
1022 return RX_CONTINUE;
1023
1024 /* management frames are already linear */
1025
1026 if (skb->len < 24 + sizeof(*mmie))
1027 return RX_DROP_UNUSABLE;
1028
1029 mmie = (struct ieee80211_mmie *)
1030 (skb->data + skb->len - sizeof(*mmie));
1031 if (mmie->element_id != WLAN_EID_MMIE ||
1032 mmie->length != sizeof(*mmie) - 2)
1033 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1034
1035 bip_ipn_swap(ipn, mmie->sequence_number);
1036
1037 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1038 key->u.aes_cmac.replays++;
1039 return RX_DROP_UNUSABLE;
1040 }
1041
1042 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1043 /* hardware didn't decrypt/verify MIC */
1044 bip_aad(skb, aad);
1045 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1046 skb->data + 24, skb->len - 24, mic);
1047 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1048 key->u.aes_cmac.icverrors++;
1049 return RX_DROP_UNUSABLE;
1050 }
1051 }
1052
1053 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1054
1055 /* Remove MMIE */
1056 skb_trim(skb, skb->len - sizeof(*mmie));
1057
1058 return RX_CONTINUE;
1059 }
1060
1061 ieee80211_rx_result
1062 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1063 {
1064 struct sk_buff *skb = rx->skb;
1065 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1066 struct ieee80211_key *key = rx->key;
1067 struct ieee80211_mmie_16 *mmie;
1068 u8 aad[20], mic[16], ipn[6];
1069 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1070
1071 if (!ieee80211_is_mgmt(hdr->frame_control))
1072 return RX_CONTINUE;
1073
1074 /* management frames are already linear */
1075
1076 if (skb->len < 24 + sizeof(*mmie))
1077 return RX_DROP_UNUSABLE;
1078
1079 mmie = (struct ieee80211_mmie_16 *)
1080 (skb->data + skb->len - sizeof(*mmie));
1081 if (mmie->element_id != WLAN_EID_MMIE ||
1082 mmie->length != sizeof(*mmie) - 2)
1083 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1084
1085 bip_ipn_swap(ipn, mmie->sequence_number);
1086
1087 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1088 key->u.aes_cmac.replays++;
1089 return RX_DROP_UNUSABLE;
1090 }
1091
1092 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1093 /* hardware didn't decrypt/verify MIC */
1094 bip_aad(skb, aad);
1095 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1096 skb->data + 24, skb->len - 24, mic);
1097 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1098 key->u.aes_cmac.icverrors++;
1099 return RX_DROP_UNUSABLE;
1100 }
1101 }
1102
1103 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1104
1105 /* Remove MMIE */
1106 skb_trim(skb, skb->len - sizeof(*mmie));
1107
1108 return RX_CONTINUE;
1109 }
1110
1111 ieee80211_tx_result
1112 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1113 {
1114 struct sk_buff *skb;
1115 struct ieee80211_tx_info *info;
1116 struct ieee80211_key *key = tx->key;
1117 struct ieee80211_mmie_16 *mmie;
1118 struct ieee80211_hdr *hdr;
1119 u8 aad[20];
1120 u64 pn64;
1121 u8 nonce[12];
1122
1123 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1124 return TX_DROP;
1125
1126 skb = skb_peek(&tx->skbs);
1127
1128 info = IEEE80211_SKB_CB(skb);
1129
1130 if (info->control.hw_key)
1131 return TX_CONTINUE;
1132
1133 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1134 return TX_DROP;
1135
1136 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1137 mmie->element_id = WLAN_EID_MMIE;
1138 mmie->length = sizeof(*mmie) - 2;
1139 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1140
1141 /* PN = PN + 1 */
1142 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1143
1144 bip_ipn_set64(mmie->sequence_number, pn64);
1145
1146 bip_aad(skb, aad);
1147
1148 hdr = (struct ieee80211_hdr *)skb->data;
1149 memcpy(nonce, hdr->addr2, ETH_ALEN);
1150 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1151
1152 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1153 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1154 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1155 return TX_DROP;
1156
1157 return TX_CONTINUE;
1158 }
1159
1160 ieee80211_rx_result
1161 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1162 {
1163 struct sk_buff *skb = rx->skb;
1164 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1165 struct ieee80211_key *key = rx->key;
1166 struct ieee80211_mmie_16 *mmie;
1167 u8 aad[20], mic[16], ipn[6], nonce[12];
1168 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1169
1170 if (!ieee80211_is_mgmt(hdr->frame_control))
1171 return RX_CONTINUE;
1172
1173 /* management frames are already linear */
1174
1175 if (skb->len < 24 + sizeof(*mmie))
1176 return RX_DROP_UNUSABLE;
1177
1178 mmie = (struct ieee80211_mmie_16 *)
1179 (skb->data + skb->len - sizeof(*mmie));
1180 if (mmie->element_id != WLAN_EID_MMIE ||
1181 mmie->length != sizeof(*mmie) - 2)
1182 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1183
1184 bip_ipn_swap(ipn, mmie->sequence_number);
1185
1186 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1187 key->u.aes_gmac.replays++;
1188 return RX_DROP_UNUSABLE;
1189 }
1190
1191 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1192 /* hardware didn't decrypt/verify MIC */
1193 bip_aad(skb, aad);
1194
1195 memcpy(nonce, hdr->addr2, ETH_ALEN);
1196 memcpy(nonce + ETH_ALEN, ipn, 6);
1197
1198 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1199 skb->data + 24, skb->len - 24,
1200 mic) < 0 ||
1201 memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1202 key->u.aes_gmac.icverrors++;
1203 return RX_DROP_UNUSABLE;
1204 }
1205 }
1206
1207 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1208
1209 /* Remove MMIE */
1210 skb_trim(skb, skb->len - sizeof(*mmie));
1211
1212 return RX_CONTINUE;
1213 }
1214
1215 ieee80211_tx_result
1216 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1217 {
1218 struct sk_buff *skb;
1219 struct ieee80211_tx_info *info = NULL;
1220 ieee80211_tx_result res;
1221
1222 skb_queue_walk(&tx->skbs, skb) {
1223 info = IEEE80211_SKB_CB(skb);
1224
1225 /* handle hw-only algorithm */
1226 if (!info->control.hw_key)
1227 return TX_DROP;
1228
1229 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1230 res = ieee80211_crypto_cs_encrypt(tx, skb);
1231 if (res != TX_CONTINUE)
1232 return res;
1233 }
1234 }
1235
1236 ieee80211_tx_set_protected(tx);
1237
1238 return TX_CONTINUE;
1239 }
1240
1241 ieee80211_rx_result
1242 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1243 {
1244 if (rx->sta && rx->sta->cipher_scheme)
1245 return ieee80211_crypto_cs_decrypt(rx);
1246
1247 return RX_DROP_UNUSABLE;
1248 }
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