1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2002-2004, Instant802 Networks, Inc.
4 * Copyright 2008, Jouni Malinen <j@w1.fi>
5 * Copyright (C) 2016-2017 Intel Deutschland GmbH
6 * Copyright (C) 2020-2023 Intel Corporation
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 <asm/unaligned.h>
16 #include <net/mac80211.h>
17 #include <crypto/aes.h>
18 #include <crypto/utils.h>
20 #include "ieee80211_i.h"
30 ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data
*tx
)
35 struct ieee80211_hdr
*hdr
;
36 struct sk_buff
*skb
= tx
->skb
;
37 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
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
))
45 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
46 if (skb
->len
< hdrlen
)
49 data
= skb
->data
+ hdrlen
;
50 data_len
= skb
->len
- hdrlen
;
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
;
57 if (info
->control
.hw_key
&&
58 (info
->flags
& IEEE80211_TX_CTL_DONTFRAG
||
59 ieee80211_hw_check(&tx
->local
->hw
, SUPPORTS_TX_FRAG
)) &&
60 !(tx
->key
->conf
.flags
& (IEEE80211_KEY_FLAG_GENERATE_MMIC
|
61 IEEE80211_KEY_FLAG_PUT_MIC_SPACE
))) {
62 /* hwaccel - with no need for SW-generated MMIC or MIC space */
66 tail
= MICHAEL_MIC_LEN
;
67 if (!info
->control
.hw_key
)
68 tail
+= IEEE80211_TKIP_ICV_LEN
;
70 if (WARN(skb_tailroom(skb
) < tail
||
71 skb_headroom(skb
) < IEEE80211_TKIP_IV_LEN
,
72 "mmic: not enough head/tail (%d/%d,%d/%d)\n",
73 skb_headroom(skb
), IEEE80211_TKIP_IV_LEN
,
74 skb_tailroom(skb
), tail
))
77 mic
= skb_put(skb
, MICHAEL_MIC_LEN
);
79 if (tx
->key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_MIC_SPACE
) {
80 /* Zeroed MIC can help with debug */
81 memset(mic
, 0, MICHAEL_MIC_LEN
);
85 key
= &tx
->key
->conf
.key
[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY
];
86 michael_mic(key
, hdr
, data
, data_len
, mic
);
87 if (unlikely(info
->flags
& IEEE80211_TX_INTFL_TKIP_MIC_FAILURE
))
95 ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data
*rx
)
97 u8
*data
, *key
= NULL
;
100 u8 mic
[MICHAEL_MIC_LEN
];
101 struct sk_buff
*skb
= rx
->skb
;
102 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
103 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
106 * it makes no sense to check for MIC errors on anything other
109 if (!ieee80211_is_data_present(hdr
->frame_control
))
113 * No way to verify the MIC if the hardware stripped it or
114 * the IV with the key index. In this case we have solely rely
115 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
116 * MIC failure report.
118 if (status
->flag
& (RX_FLAG_MMIC_STRIPPED
| RX_FLAG_IV_STRIPPED
)) {
119 if (status
->flag
& RX_FLAG_MMIC_ERROR
)
120 goto mic_fail_no_key
;
122 if (!(status
->flag
& RX_FLAG_IV_STRIPPED
) && rx
->key
&&
123 rx
->key
->conf
.cipher
== WLAN_CIPHER_SUITE_TKIP
)
130 * Some hardware seems to generate Michael MIC failure reports; even
131 * though, the frame was not encrypted with TKIP and therefore has no
132 * MIC. Ignore the flag them to avoid triggering countermeasures.
134 if (!rx
->key
|| rx
->key
->conf
.cipher
!= WLAN_CIPHER_SUITE_TKIP
||
135 !(status
->flag
& RX_FLAG_DECRYPTED
))
138 if (rx
->sdata
->vif
.type
== NL80211_IFTYPE_AP
&& rx
->key
->conf
.keyidx
) {
140 * APs with pairwise keys should never receive Michael MIC
141 * errors for non-zero keyidx because these are reserved for
142 * group keys and only the AP is sending real multicast
145 return RX_DROP_U_AP_RX_GROUPCAST
;
148 if (status
->flag
& RX_FLAG_MMIC_ERROR
)
151 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
152 if (skb
->len
< hdrlen
+ MICHAEL_MIC_LEN
)
153 return RX_DROP_U_SHORT_MMIC
;
155 if (skb_linearize(rx
->skb
))
156 return RX_DROP_U_OOM
;
157 hdr
= (void *)skb
->data
;
159 data
= skb
->data
+ hdrlen
;
160 data_len
= skb
->len
- hdrlen
- MICHAEL_MIC_LEN
;
161 key
= &rx
->key
->conf
.key
[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY
];
162 michael_mic(key
, hdr
, data
, data_len
, mic
);
163 if (crypto_memneq(mic
, data
+ data_len
, MICHAEL_MIC_LEN
))
166 /* remove Michael MIC from payload */
167 skb_trim(skb
, skb
->len
- MICHAEL_MIC_LEN
);
170 /* update IV in key information to be able to detect replays */
171 rx
->key
->u
.tkip
.rx
[rx
->security_idx
].iv32
= rx
->tkip
.iv32
;
172 rx
->key
->u
.tkip
.rx
[rx
->security_idx
].iv16
= rx
->tkip
.iv16
;
177 rx
->key
->u
.tkip
.mic_failures
++;
181 * In some cases the key can be unset - e.g. a multicast packet, in
182 * a driver that supports HW encryption. Send up the key idx only if
185 cfg80211_michael_mic_failure(rx
->sdata
->dev
, hdr
->addr2
,
186 is_multicast_ether_addr(hdr
->addr1
) ?
187 NL80211_KEYTYPE_GROUP
:
188 NL80211_KEYTYPE_PAIRWISE
,
189 rx
->key
? rx
->key
->conf
.keyidx
: -1,
191 return RX_DROP_U_MMIC_FAIL
;
194 static int tkip_encrypt_skb(struct ieee80211_tx_data
*tx
, struct sk_buff
*skb
)
196 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
197 struct ieee80211_key
*key
= tx
->key
;
198 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
204 if (info
->control
.hw_key
&&
205 !(info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) &&
206 !(info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
)) {
207 /* hwaccel - with no need for software-generated IV */
211 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
212 len
= skb
->len
- hdrlen
;
214 if (info
->control
.hw_key
)
217 tail
= IEEE80211_TKIP_ICV_LEN
;
219 if (WARN_ON(skb_tailroom(skb
) < tail
||
220 skb_headroom(skb
) < IEEE80211_TKIP_IV_LEN
))
223 pos
= skb_push(skb
, IEEE80211_TKIP_IV_LEN
);
224 memmove(pos
, pos
+ IEEE80211_TKIP_IV_LEN
, hdrlen
);
227 /* the HW only needs room for the IV, but not the actual IV */
228 if (info
->control
.hw_key
&&
229 (info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
))
232 /* Increase IV for the frame */
233 pn
= atomic64_inc_return(&key
->conf
.tx_pn
);
234 pos
= ieee80211_tkip_add_iv(pos
, &key
->conf
, pn
);
236 /* hwaccel - with software IV */
237 if (info
->control
.hw_key
)
240 /* Add room for ICV */
241 skb_put(skb
, IEEE80211_TKIP_ICV_LEN
);
243 return ieee80211_tkip_encrypt_data(&tx
->local
->wep_tx_ctx
,
249 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data
*tx
)
253 ieee80211_tx_set_protected(tx
);
255 skb_queue_walk(&tx
->skbs
, skb
) {
256 if (tkip_encrypt_skb(tx
, skb
) < 0)
265 ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data
*rx
)
267 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) rx
->skb
->data
;
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
= IEEE80211_SKB_RXCB(skb
);
273 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
275 if (!ieee80211_is_data(hdr
->frame_control
))
278 if (!rx
->sta
|| skb
->len
- hdrlen
< 12)
279 return RX_DROP_U_SHORT_TKIP
;
281 /* it may be possible to optimize this a bit more */
282 if (skb_linearize(rx
->skb
))
283 return RX_DROP_U_OOM
;
284 hdr
= (void *)skb
->data
;
287 * Let TKIP code verify IV, but skip decryption.
288 * In the case where hardware checks the IV as well,
289 * we don't even get here, see ieee80211_rx_h_decrypt()
291 if (status
->flag
& RX_FLAG_DECRYPTED
)
294 res
= ieee80211_tkip_decrypt_data(&rx
->local
->wep_rx_ctx
,
295 key
, skb
->data
+ hdrlen
,
296 skb
->len
- hdrlen
, rx
->sta
->sta
.addr
,
297 hdr
->addr1
, hwaccel
, rx
->security_idx
,
300 if (res
!= TKIP_DECRYPT_OK
)
301 return RX_DROP_U_TKIP_FAIL
;
304 if (!(status
->flag
& RX_FLAG_ICV_STRIPPED
))
305 skb_trim(skb
, skb
->len
- IEEE80211_TKIP_ICV_LEN
);
308 memmove(skb
->data
+ IEEE80211_TKIP_IV_LEN
, skb
->data
, hdrlen
);
309 skb_pull(skb
, IEEE80211_TKIP_IV_LEN
);
315 * Calculate AAD for CCMP/GCMP, returning qos_tid since we
316 * need that in CCMP also for b_0.
318 static u8
ccmp_gcmp_aad(struct sk_buff
*skb
, u8
*aad
)
320 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
322 int a4_included
, mgmt
;
327 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
328 * Retry, PwrMgt, MoreData, Order (if Qos Data); set Protected
330 mgmt
= ieee80211_is_mgmt(hdr
->frame_control
);
331 mask_fc
= hdr
->frame_control
;
332 mask_fc
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
|
333 IEEE80211_FCTL_PM
| IEEE80211_FCTL_MOREDATA
);
335 mask_fc
&= ~cpu_to_le16(0x0070);
336 mask_fc
|= cpu_to_le16(IEEE80211_FCTL_PROTECTED
);
338 a4_included
= ieee80211_has_a4(hdr
->frame_control
);
342 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
343 qos_tid
= ieee80211_get_tid(hdr
);
344 mask_fc
&= ~cpu_to_le16(IEEE80211_FCTL_ORDER
);
350 /* AAD (extra authenticate-only data) / masked 802.11 header
351 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
352 put_unaligned_be16(len_a
, &aad
[0]);
353 put_unaligned(mask_fc
, (__le16
*)&aad
[2]);
354 memcpy(&aad
[4], &hdr
->addrs
, 3 * ETH_ALEN
);
356 /* Mask Seq#, leave Frag# */
357 aad
[22] = *((u8
*) &hdr
->seq_ctrl
) & 0x0f;
361 memcpy(&aad
[24], hdr
->addr4
, ETH_ALEN
);
365 memset(&aad
[24], 0, ETH_ALEN
+ IEEE80211_QOS_CTL_LEN
);
372 static void ccmp_special_blocks(struct sk_buff
*skb
, u8
*pn
, u8
*b_0
, u8
*aad
)
374 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
375 u8 qos_tid
= ccmp_gcmp_aad(skb
, aad
);
377 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
378 * mode authentication are not allowed to collide, yet both are derived
379 * from this vector b_0. We only set L := 1 here to indicate that the
380 * data size can be represented in (L+1) bytes. The CCM layer will take
381 * care of storing the data length in the top (L+1) bytes and setting
382 * and clearing the other bits as is required to derive the two IVs.
386 /* Nonce: Nonce Flags | A2 | PN
387 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
389 b_0
[1] = qos_tid
| (ieee80211_is_mgmt(hdr
->frame_control
) << 4);
390 memcpy(&b_0
[2], hdr
->addr2
, ETH_ALEN
);
391 memcpy(&b_0
[8], pn
, IEEE80211_CCMP_PN_LEN
);
394 static inline void ccmp_pn2hdr(u8
*hdr
, u8
*pn
, int key_id
)
399 hdr
[3] = 0x20 | (key_id
<< 6);
407 static inline void ccmp_hdr2pn(u8
*pn
, u8
*hdr
)
418 static int ccmp_encrypt_skb(struct ieee80211_tx_data
*tx
, struct sk_buff
*skb
,
419 unsigned int mic_len
)
421 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
422 struct ieee80211_key
*key
= tx
->key
;
423 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
424 int hdrlen
, len
, tail
;
429 u8 b_0
[AES_BLOCK_SIZE
];
431 if (info
->control
.hw_key
&&
432 !(info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) &&
433 !(info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
) &&
434 !((info
->control
.hw_key
->flags
&
435 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT
) &&
436 ieee80211_is_mgmt(hdr
->frame_control
))) {
438 * hwaccel has no need for preallocated room for CCMP
439 * header or MIC fields
444 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
445 len
= skb
->len
- hdrlen
;
447 if (info
->control
.hw_key
)
452 if (WARN_ON(skb_tailroom(skb
) < tail
||
453 skb_headroom(skb
) < IEEE80211_CCMP_HDR_LEN
))
456 pos
= skb_push(skb
, IEEE80211_CCMP_HDR_LEN
);
457 memmove(pos
, pos
+ IEEE80211_CCMP_HDR_LEN
, hdrlen
);
459 /* the HW only needs room for the IV, but not the actual IV */
460 if (info
->control
.hw_key
&&
461 (info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
))
466 pn64
= atomic64_inc_return(&key
->conf
.tx_pn
);
475 ccmp_pn2hdr(pos
, pn
, key
->conf
.keyidx
);
477 /* hwaccel - with software CCMP header */
478 if (info
->control
.hw_key
)
481 pos
+= IEEE80211_CCMP_HDR_LEN
;
482 ccmp_special_blocks(skb
, pn
, b_0
, aad
);
483 return ieee80211_aes_ccm_encrypt(key
->u
.ccmp
.tfm
, b_0
, aad
, pos
, len
,
484 skb_put(skb
, mic_len
));
489 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data
*tx
,
490 unsigned int mic_len
)
494 ieee80211_tx_set_protected(tx
);
496 skb_queue_walk(&tx
->skbs
, skb
) {
497 if (ccmp_encrypt_skb(tx
, skb
, mic_len
) < 0)
506 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data
*rx
,
507 unsigned int mic_len
)
509 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
511 struct ieee80211_key
*key
= rx
->key
;
512 struct sk_buff
*skb
= rx
->skb
;
513 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
514 u8 pn
[IEEE80211_CCMP_PN_LEN
];
518 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
520 if (!ieee80211_is_data(hdr
->frame_control
) &&
521 !ieee80211_is_robust_mgmt_frame(skb
))
524 if (status
->flag
& RX_FLAG_DECRYPTED
) {
525 if (!pskb_may_pull(rx
->skb
, hdrlen
+ IEEE80211_CCMP_HDR_LEN
))
526 return RX_DROP_U_SHORT_CCMP
;
527 if (status
->flag
& RX_FLAG_MIC_STRIPPED
)
530 if (skb_linearize(rx
->skb
))
531 return RX_DROP_U_OOM
;
534 /* reload hdr - skb might have been reallocated */
535 hdr
= (void *)rx
->skb
->data
;
537 data_len
= skb
->len
- hdrlen
- IEEE80211_CCMP_HDR_LEN
- mic_len
;
538 if (!rx
->sta
|| data_len
< 0)
539 return RX_DROP_U_SHORT_CCMP
;
541 if (!(status
->flag
& RX_FLAG_PN_VALIDATED
)) {
544 ccmp_hdr2pn(pn
, skb
->data
+ hdrlen
);
546 queue
= rx
->security_idx
;
548 res
= memcmp(pn
, key
->u
.ccmp
.rx_pn
[queue
],
549 IEEE80211_CCMP_PN_LEN
);
551 (!res
&& !(status
->flag
& RX_FLAG_ALLOW_SAME_PN
))) {
552 key
->u
.ccmp
.replays
++;
553 return RX_DROP_U_REPLAY
;
556 if (!(status
->flag
& RX_FLAG_DECRYPTED
)) {
557 u8 aad
[2 * AES_BLOCK_SIZE
];
558 u8 b_0
[AES_BLOCK_SIZE
];
559 /* hardware didn't decrypt/verify MIC */
560 ccmp_special_blocks(skb
, pn
, b_0
, aad
);
562 if (ieee80211_aes_ccm_decrypt(
563 key
->u
.ccmp
.tfm
, b_0
, aad
,
564 skb
->data
+ hdrlen
+ IEEE80211_CCMP_HDR_LEN
,
566 skb
->data
+ skb
->len
- mic_len
))
567 return RX_DROP_U_MIC_FAIL
;
570 memcpy(key
->u
.ccmp
.rx_pn
[queue
], pn
, IEEE80211_CCMP_PN_LEN
);
571 if (unlikely(ieee80211_is_frag(hdr
)))
572 memcpy(rx
->ccm_gcm
.pn
, pn
, IEEE80211_CCMP_PN_LEN
);
575 /* Remove CCMP header and MIC */
576 if (pskb_trim(skb
, skb
->len
- mic_len
))
577 return RX_DROP_U_SHORT_CCMP_MIC
;
578 memmove(skb
->data
+ IEEE80211_CCMP_HDR_LEN
, skb
->data
, hdrlen
);
579 skb_pull(skb
, IEEE80211_CCMP_HDR_LEN
);
584 static void gcmp_special_blocks(struct sk_buff
*skb
, u8
*pn
, u8
*j_0
, u8
*aad
)
586 struct ieee80211_hdr
*hdr
= (void *)skb
->data
;
588 memcpy(j_0
, hdr
->addr2
, ETH_ALEN
);
589 memcpy(&j_0
[ETH_ALEN
], pn
, IEEE80211_GCMP_PN_LEN
);
592 j_0
[AES_BLOCK_SIZE
- 1] = 0x01;
594 ccmp_gcmp_aad(skb
, aad
);
597 static inline void gcmp_pn2hdr(u8
*hdr
, const u8
*pn
, int key_id
)
602 hdr
[3] = 0x20 | (key_id
<< 6);
609 static inline void gcmp_hdr2pn(u8
*pn
, const u8
*hdr
)
619 static int gcmp_encrypt_skb(struct ieee80211_tx_data
*tx
, struct sk_buff
*skb
)
621 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
622 struct ieee80211_key
*key
= tx
->key
;
623 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
624 int hdrlen
, len
, tail
;
629 u8 j_0
[AES_BLOCK_SIZE
];
631 if (info
->control
.hw_key
&&
632 !(info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) &&
633 !(info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
) &&
634 !((info
->control
.hw_key
->flags
&
635 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT
) &&
636 ieee80211_is_mgmt(hdr
->frame_control
))) {
637 /* hwaccel has no need for preallocated room for GCMP
638 * header or MIC fields
643 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
644 len
= skb
->len
- hdrlen
;
646 if (info
->control
.hw_key
)
649 tail
= IEEE80211_GCMP_MIC_LEN
;
651 if (WARN_ON(skb_tailroom(skb
) < tail
||
652 skb_headroom(skb
) < IEEE80211_GCMP_HDR_LEN
))
655 pos
= skb_push(skb
, IEEE80211_GCMP_HDR_LEN
);
656 memmove(pos
, pos
+ IEEE80211_GCMP_HDR_LEN
, hdrlen
);
657 skb_set_network_header(skb
, skb_network_offset(skb
) +
658 IEEE80211_GCMP_HDR_LEN
);
660 /* the HW only needs room for the IV, but not the actual IV */
661 if (info
->control
.hw_key
&&
662 (info
->control
.hw_key
->flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
))
667 pn64
= atomic64_inc_return(&key
->conf
.tx_pn
);
676 gcmp_pn2hdr(pos
, pn
, key
->conf
.keyidx
);
678 /* hwaccel - with software GCMP header */
679 if (info
->control
.hw_key
)
682 pos
+= IEEE80211_GCMP_HDR_LEN
;
683 gcmp_special_blocks(skb
, pn
, j_0
, aad
);
684 return ieee80211_aes_gcm_encrypt(key
->u
.gcmp
.tfm
, j_0
, aad
, pos
, len
,
685 skb_put(skb
, IEEE80211_GCMP_MIC_LEN
));
689 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data
*tx
)
693 ieee80211_tx_set_protected(tx
);
695 skb_queue_walk(&tx
->skbs
, skb
) {
696 if (gcmp_encrypt_skb(tx
, skb
) < 0)
704 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data
*rx
)
706 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)rx
->skb
->data
;
708 struct ieee80211_key
*key
= rx
->key
;
709 struct sk_buff
*skb
= rx
->skb
;
710 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
711 u8 pn
[IEEE80211_GCMP_PN_LEN
];
712 int data_len
, queue
, mic_len
= IEEE80211_GCMP_MIC_LEN
;
714 hdrlen
= ieee80211_hdrlen(hdr
->frame_control
);
716 if (!ieee80211_is_data(hdr
->frame_control
) &&
717 !ieee80211_is_robust_mgmt_frame(skb
))
720 if (status
->flag
& RX_FLAG_DECRYPTED
) {
721 if (!pskb_may_pull(rx
->skb
, hdrlen
+ IEEE80211_GCMP_HDR_LEN
))
722 return RX_DROP_U_SHORT_GCMP
;
723 if (status
->flag
& RX_FLAG_MIC_STRIPPED
)
726 if (skb_linearize(rx
->skb
))
727 return RX_DROP_U_OOM
;
730 /* reload hdr - skb might have been reallocated */
731 hdr
= (void *)rx
->skb
->data
;
733 data_len
= skb
->len
- hdrlen
- IEEE80211_GCMP_HDR_LEN
- mic_len
;
734 if (!rx
->sta
|| data_len
< 0)
735 return RX_DROP_U_SHORT_GCMP
;
737 if (!(status
->flag
& RX_FLAG_PN_VALIDATED
)) {
740 gcmp_hdr2pn(pn
, skb
->data
+ hdrlen
);
742 queue
= rx
->security_idx
;
744 res
= memcmp(pn
, key
->u
.gcmp
.rx_pn
[queue
],
745 IEEE80211_GCMP_PN_LEN
);
747 (!res
&& !(status
->flag
& RX_FLAG_ALLOW_SAME_PN
))) {
748 key
->u
.gcmp
.replays
++;
749 return RX_DROP_U_REPLAY
;
752 if (!(status
->flag
& RX_FLAG_DECRYPTED
)) {
753 u8 aad
[2 * AES_BLOCK_SIZE
];
754 u8 j_0
[AES_BLOCK_SIZE
];
755 /* hardware didn't decrypt/verify MIC */
756 gcmp_special_blocks(skb
, pn
, j_0
, aad
);
758 if (ieee80211_aes_gcm_decrypt(
759 key
->u
.gcmp
.tfm
, j_0
, aad
,
760 skb
->data
+ hdrlen
+ IEEE80211_GCMP_HDR_LEN
,
762 skb
->data
+ skb
->len
-
763 IEEE80211_GCMP_MIC_LEN
))
764 return RX_DROP_U_MIC_FAIL
;
767 memcpy(key
->u
.gcmp
.rx_pn
[queue
], pn
, IEEE80211_GCMP_PN_LEN
);
768 if (unlikely(ieee80211_is_frag(hdr
)))
769 memcpy(rx
->ccm_gcm
.pn
, pn
, IEEE80211_CCMP_PN_LEN
);
772 /* Remove GCMP header and MIC */
773 if (pskb_trim(skb
, skb
->len
- mic_len
))
774 return RX_DROP_U_SHORT_GCMP_MIC
;
775 memmove(skb
->data
+ IEEE80211_GCMP_HDR_LEN
, skb
->data
, hdrlen
);
776 skb_pull(skb
, IEEE80211_GCMP_HDR_LEN
);
781 static void bip_aad(struct sk_buff
*skb
, u8
*aad
)
784 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
786 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
788 /* FC type/subtype */
789 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
790 mask_fc
= hdr
->frame_control
;
791 mask_fc
&= ~cpu_to_le16(IEEE80211_FCTL_RETRY
| IEEE80211_FCTL_PM
|
792 IEEE80211_FCTL_MOREDATA
);
793 put_unaligned(mask_fc
, (__le16
*) &aad
[0]);
795 memcpy(aad
+ 2, &hdr
->addrs
, 3 * ETH_ALEN
);
799 static inline void bip_ipn_set64(u8
*d
, u64 pn
)
809 static inline void bip_ipn_swap(u8
*d
, const u8
*s
)
821 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data
*tx
)
824 struct ieee80211_tx_info
*info
;
825 struct ieee80211_key
*key
= tx
->key
;
826 struct ieee80211_mmie
*mmie
;
830 if (WARN_ON(skb_queue_len(&tx
->skbs
) != 1))
833 skb
= skb_peek(&tx
->skbs
);
835 info
= IEEE80211_SKB_CB(skb
);
837 if (info
->control
.hw_key
&&
838 !(key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIE
))
841 if (WARN_ON(skb_tailroom(skb
) < sizeof(*mmie
)))
844 mmie
= skb_put(skb
, sizeof(*mmie
));
845 mmie
->element_id
= WLAN_EID_MMIE
;
846 mmie
->length
= sizeof(*mmie
) - 2;
847 mmie
->key_id
= cpu_to_le16(key
->conf
.keyidx
);
850 pn64
= atomic64_inc_return(&key
->conf
.tx_pn
);
852 bip_ipn_set64(mmie
->sequence_number
, pn64
);
854 if (info
->control
.hw_key
)
860 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
862 ieee80211_aes_cmac(key
->u
.aes_cmac
.tfm
, aad
,
863 skb
->data
+ 24, skb
->len
- 24, mmie
->mic
);
869 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data
*tx
)
872 struct ieee80211_tx_info
*info
;
873 struct ieee80211_key
*key
= tx
->key
;
874 struct ieee80211_mmie_16
*mmie
;
878 if (WARN_ON(skb_queue_len(&tx
->skbs
) != 1))
881 skb
= skb_peek(&tx
->skbs
);
883 info
= IEEE80211_SKB_CB(skb
);
885 if (info
->control
.hw_key
)
888 if (WARN_ON(skb_tailroom(skb
) < sizeof(*mmie
)))
891 mmie
= skb_put(skb
, sizeof(*mmie
));
892 mmie
->element_id
= WLAN_EID_MMIE
;
893 mmie
->length
= sizeof(*mmie
) - 2;
894 mmie
->key_id
= cpu_to_le16(key
->conf
.keyidx
);
897 pn64
= atomic64_inc_return(&key
->conf
.tx_pn
);
899 bip_ipn_set64(mmie
->sequence_number
, pn64
);
903 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
905 ieee80211_aes_cmac_256(key
->u
.aes_cmac
.tfm
, aad
,
906 skb
->data
+ 24, skb
->len
- 24, mmie
->mic
);
912 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data
*rx
)
914 struct sk_buff
*skb
= rx
->skb
;
915 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
916 struct ieee80211_key
*key
= rx
->key
;
917 struct ieee80211_mmie
*mmie
;
918 u8 aad
[20], mic
[8], ipn
[6];
919 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
921 if (!ieee80211_is_mgmt(hdr
->frame_control
))
924 /* management frames are already linear */
926 if (skb
->len
< 24 + sizeof(*mmie
))
927 return RX_DROP_U_SHORT_CMAC
;
929 mmie
= (struct ieee80211_mmie
*)
930 (skb
->data
+ skb
->len
- sizeof(*mmie
));
931 if (mmie
->element_id
!= WLAN_EID_MMIE
||
932 mmie
->length
!= sizeof(*mmie
) - 2)
933 return RX_DROP_U_BAD_MMIE
; /* Invalid MMIE */
935 bip_ipn_swap(ipn
, mmie
->sequence_number
);
937 if (memcmp(ipn
, key
->u
.aes_cmac
.rx_pn
, 6) <= 0) {
938 key
->u
.aes_cmac
.replays
++;
939 return RX_DROP_U_REPLAY
;
942 if (!(status
->flag
& RX_FLAG_DECRYPTED
)) {
943 /* hardware didn't decrypt/verify MIC */
945 ieee80211_aes_cmac(key
->u
.aes_cmac
.tfm
, aad
,
946 skb
->data
+ 24, skb
->len
- 24, mic
);
947 if (crypto_memneq(mic
, mmie
->mic
, sizeof(mmie
->mic
))) {
948 key
->u
.aes_cmac
.icverrors
++;
949 return RX_DROP_U_MIC_FAIL
;
953 memcpy(key
->u
.aes_cmac
.rx_pn
, ipn
, 6);
956 skb_trim(skb
, skb
->len
- sizeof(*mmie
));
962 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data
*rx
)
964 struct sk_buff
*skb
= rx
->skb
;
965 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
966 struct ieee80211_key
*key
= rx
->key
;
967 struct ieee80211_mmie_16
*mmie
;
968 u8 aad
[20], mic
[16], ipn
[6];
969 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
971 if (!ieee80211_is_mgmt(hdr
->frame_control
))
974 /* management frames are already linear */
976 if (skb
->len
< 24 + sizeof(*mmie
))
977 return RX_DROP_U_SHORT_CMAC256
;
979 mmie
= (struct ieee80211_mmie_16
*)
980 (skb
->data
+ skb
->len
- sizeof(*mmie
));
981 if (mmie
->element_id
!= WLAN_EID_MMIE
||
982 mmie
->length
!= sizeof(*mmie
) - 2)
983 return RX_DROP_U_BAD_MMIE
; /* Invalid MMIE */
985 bip_ipn_swap(ipn
, mmie
->sequence_number
);
987 if (memcmp(ipn
, key
->u
.aes_cmac
.rx_pn
, 6) <= 0) {
988 key
->u
.aes_cmac
.replays
++;
989 return RX_DROP_U_REPLAY
;
992 if (!(status
->flag
& RX_FLAG_DECRYPTED
)) {
993 /* hardware didn't decrypt/verify MIC */
995 ieee80211_aes_cmac_256(key
->u
.aes_cmac
.tfm
, aad
,
996 skb
->data
+ 24, skb
->len
- 24, mic
);
997 if (crypto_memneq(mic
, mmie
->mic
, sizeof(mmie
->mic
))) {
998 key
->u
.aes_cmac
.icverrors
++;
999 return RX_DROP_U_MIC_FAIL
;
1003 memcpy(key
->u
.aes_cmac
.rx_pn
, ipn
, 6);
1006 skb_trim(skb
, skb
->len
- sizeof(*mmie
));
1012 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data
*tx
)
1014 struct sk_buff
*skb
;
1015 struct ieee80211_tx_info
*info
;
1016 struct ieee80211_key
*key
= tx
->key
;
1017 struct ieee80211_mmie_16
*mmie
;
1018 struct ieee80211_hdr
*hdr
;
1019 u8 aad
[GMAC_AAD_LEN
];
1021 u8 nonce
[GMAC_NONCE_LEN
];
1023 if (WARN_ON(skb_queue_len(&tx
->skbs
) != 1))
1026 skb
= skb_peek(&tx
->skbs
);
1028 info
= IEEE80211_SKB_CB(skb
);
1030 if (info
->control
.hw_key
)
1033 if (WARN_ON(skb_tailroom(skb
) < sizeof(*mmie
)))
1036 mmie
= skb_put(skb
, sizeof(*mmie
));
1037 mmie
->element_id
= WLAN_EID_MMIE
;
1038 mmie
->length
= sizeof(*mmie
) - 2;
1039 mmie
->key_id
= cpu_to_le16(key
->conf
.keyidx
);
1042 pn64
= atomic64_inc_return(&key
->conf
.tx_pn
);
1044 bip_ipn_set64(mmie
->sequence_number
, pn64
);
1048 hdr
= (struct ieee80211_hdr
*)skb
->data
;
1049 memcpy(nonce
, hdr
->addr2
, ETH_ALEN
);
1050 bip_ipn_swap(nonce
+ ETH_ALEN
, mmie
->sequence_number
);
1052 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1053 if (ieee80211_aes_gmac(key
->u
.aes_gmac
.tfm
, aad
, nonce
,
1054 skb
->data
+ 24, skb
->len
- 24, mmie
->mic
) < 0)
1061 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data
*rx
)
1063 struct sk_buff
*skb
= rx
->skb
;
1064 struct ieee80211_rx_status
*status
= IEEE80211_SKB_RXCB(skb
);
1065 struct ieee80211_key
*key
= rx
->key
;
1066 struct ieee80211_mmie_16
*mmie
;
1067 u8 aad
[GMAC_AAD_LEN
], *mic
, ipn
[6], nonce
[GMAC_NONCE_LEN
];
1068 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1070 if (!ieee80211_is_mgmt(hdr
->frame_control
))
1073 /* management frames are already linear */
1075 if (skb
->len
< 24 + sizeof(*mmie
))
1076 return RX_DROP_U_SHORT_GMAC
;
1078 mmie
= (struct ieee80211_mmie_16
*)
1079 (skb
->data
+ skb
->len
- sizeof(*mmie
));
1080 if (mmie
->element_id
!= WLAN_EID_MMIE
||
1081 mmie
->length
!= sizeof(*mmie
) - 2)
1082 return RX_DROP_U_BAD_MMIE
; /* Invalid MMIE */
1084 bip_ipn_swap(ipn
, mmie
->sequence_number
);
1086 if (memcmp(ipn
, key
->u
.aes_gmac
.rx_pn
, 6) <= 0) {
1087 key
->u
.aes_gmac
.replays
++;
1088 return RX_DROP_U_REPLAY
;
1091 if (!(status
->flag
& RX_FLAG_DECRYPTED
)) {
1092 /* hardware didn't decrypt/verify MIC */
1095 memcpy(nonce
, hdr
->addr2
, ETH_ALEN
);
1096 memcpy(nonce
+ ETH_ALEN
, ipn
, 6);
1098 mic
= kmalloc(GMAC_MIC_LEN
, GFP_ATOMIC
);
1100 return RX_DROP_U_OOM
;
1101 if (ieee80211_aes_gmac(key
->u
.aes_gmac
.tfm
, aad
, nonce
,
1102 skb
->data
+ 24, skb
->len
- 24,
1104 crypto_memneq(mic
, mmie
->mic
, sizeof(mmie
->mic
))) {
1105 key
->u
.aes_gmac
.icverrors
++;
1107 return RX_DROP_U_MIC_FAIL
;
1112 memcpy(key
->u
.aes_gmac
.rx_pn
, ipn
, 6);
1115 skb_trim(skb
, skb
->len
- sizeof(*mmie
));