2 * Copyright 2002-2004, Instant802 Networks, Inc.
3 * Copyright 2008, Jouni Malinen <j@w1.fi>
4 * Copyright (C) 2016 Intel Deutschland GmbH
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/netdevice.h>
12 #include <linux/types.h>
13 #include <linux/skbuff.h>
14 #include <linux/compiler.h>
15 #include <linux/ieee80211.h>
16 #include <linux/gfp.h>
17 #include <asm/unaligned.h>
18 #include <net/mac80211.h>
19 #include <crypto/aes.h>
21 #include "ieee80211_i.h"
31 ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
36 struct ieee80211_hdr *hdr;
37 struct sk_buff *skb = tx->skb;
38 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
41 hdr = (struct ieee80211_hdr *)skb->data;
42 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
43 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
46 hdrlen = ieee80211_hdrlen(hdr->frame_control);
47 if (skb->len < hdrlen)
50 data = skb->data + hdrlen;
51 data_len = skb->len - hdrlen;
53 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
54 /* Need to use software crypto for the test */
55 info->control.hw_key = NULL;
58 if (info->control.hw_key &&
59 (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
60 tx->local->ops->set_frag_threshold) &&
61 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
62 /* hwaccel - with no need for SW-generated MMIC */
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 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
78 mic = skb_put(skb, MICHAEL_MIC_LEN);
79 michael_mic(key, hdr, data, data_len, mic);
80 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
88 ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
90 u8 *data, *key = NULL;
93 u8 mic[MICHAEL_MIC_LEN];
94 struct sk_buff *skb = rx->skb;
95 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
96 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
99 * it makes no sense to check for MIC errors on anything other
102 if (!ieee80211_is_data_present(hdr->frame_control))
106 * No way to verify the MIC if the hardware stripped it or
107 * the IV with the key index. In this case we have solely rely
108 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
109 * MIC failure report.
111 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
112 if (status->flag & RX_FLAG_MMIC_ERROR)
113 goto mic_fail_no_key;
115 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
116 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
123 * Some hardware seems to generate Michael MIC failure reports; even
124 * though, the frame was not encrypted with TKIP and therefore has no
125 * MIC. Ignore the flag them to avoid triggering countermeasures.
127 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
128 !(status->flag & RX_FLAG_DECRYPTED))
131 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
133 * APs with pairwise keys should never receive Michael MIC
134 * errors for non-zero keyidx because these are reserved for
135 * group keys and only the AP is sending real multicast
138 return RX_DROP_UNUSABLE;
141 if (status->flag & RX_FLAG_MMIC_ERROR)
144 hdrlen = ieee80211_hdrlen(hdr->frame_control);
145 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
146 return RX_DROP_UNUSABLE;
148 if (skb_linearize(rx->skb))
149 return RX_DROP_UNUSABLE;
150 hdr = (void *)skb->data;
152 data = skb->data + hdrlen;
153 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
154 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
155 michael_mic(key, hdr, data, data_len, mic);
156 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0)
159 /* remove Michael MIC from payload */
160 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
163 /* update IV in key information to be able to detect replays */
164 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32;
165 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16;
170 rx->key->u.tkip.mic_failures++;
174 * In some cases the key can be unset - e.g. a multicast packet, in
175 * a driver that supports HW encryption. Send up the key idx only if
178 cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2,
179 is_multicast_ether_addr(hdr->addr1) ?
180 NL80211_KEYTYPE_GROUP :
181 NL80211_KEYTYPE_PAIRWISE,
182 rx->key ? rx->key->conf.keyidx : -1,
184 return RX_DROP_UNUSABLE;
187 static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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);
197 if (info->control.hw_key &&
198 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
199 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
200 /* hwaccel - with no need for software-generated IV */
204 hdrlen = ieee80211_hdrlen(hdr->frame_control);
205 len = skb->len - hdrlen;
207 if (info->control.hw_key)
210 tail = IEEE80211_TKIP_ICV_LEN;
212 if (WARN_ON(skb_tailroom(skb) < tail ||
213 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
216 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
217 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
220 /* the HW only needs room for the IV, but not the actual IV */
221 if (info->control.hw_key &&
222 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
225 /* Increase IV for the frame */
226 pn = atomic64_inc_return(&key->conf.tx_pn);
227 pos = ieee80211_tkip_add_iv(pos, &key->conf, pn);
229 /* hwaccel - with software IV */
230 if (info->control.hw_key)
233 /* Add room for ICV */
234 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
236 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
242 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
246 ieee80211_tx_set_protected(tx);
248 skb_queue_walk(&tx->skbs, skb) {
249 if (tkip_encrypt_skb(tx, skb) < 0)
258 ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
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);
266 hdrlen = ieee80211_hdrlen(hdr->frame_control);
268 if (!ieee80211_is_data(hdr->frame_control))
271 if (!rx->sta || skb->len - hdrlen < 12)
272 return RX_DROP_UNUSABLE;
274 /* it may be possible to optimize this a bit more */
275 if (skb_linearize(rx->skb))
276 return RX_DROP_UNUSABLE;
277 hdr = (void *)skb->data;
280 * Let TKIP code verify IV, but skip decryption.
281 * In the case where hardware checks the IV as well,
282 * we don't even get here, see ieee80211_rx_h_decrypt()
284 if (status->flag & RX_FLAG_DECRYPTED)
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,
293 if (res != TKIP_DECRYPT_OK)
294 return RX_DROP_UNUSABLE;
297 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
300 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
301 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
307 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
310 int a4_included, mgmt;
314 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
317 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
318 * Retry, PwrMgt, MoreData; set Protected
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);
325 mask_fc &= ~cpu_to_le16(0x0070);
326 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
328 hdrlen = ieee80211_hdrlen(hdr->frame_control);
330 a4_included = ieee80211_has_a4(hdr->frame_control);
332 if (ieee80211_is_data_qos(hdr->frame_control))
333 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
337 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
338 * mode authentication are not allowed to collide, yet both are derived
339 * from this vector b_0. We only set L := 1 here to indicate that the
340 * data size can be represented in (L+1) bytes. The CCM layer will take
341 * care of storing the data length in the top (L+1) bytes and setting
342 * and clearing the other bits as is required to derive the two IVs.
346 /* Nonce: Nonce Flags | A2 | PN
347 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
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);
353 /* AAD (extra authenticate-only data) / masked 802.11 header
354 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
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);
359 /* Mask Seq#, leave Frag# */
360 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
364 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
368 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
374 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
379 hdr[3] = 0x20 | (key_id << 6);
387 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
398 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
399 unsigned int mic_len)
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;
408 u8 aad[2 * AES_BLOCK_SIZE];
409 u8 b_0[AES_BLOCK_SIZE];
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))) {
418 * hwaccel has no need for preallocated room for CCMP
419 * header or MIC fields
424 hdrlen = ieee80211_hdrlen(hdr->frame_control);
425 len = skb->len - hdrlen;
427 if (info->control.hw_key)
432 if (WARN_ON(skb_tailroom(skb) < tail ||
433 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
436 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
437 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
439 /* the HW only needs room for the IV, but not the actual IV */
440 if (info->control.hw_key &&
441 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
444 hdr = (struct ieee80211_hdr *) pos;
447 pn64 = atomic64_inc_return(&key->conf.tx_pn);
456 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
458 /* hwaccel - with software CCMP header */
459 if (info->control.hw_key)
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);
472 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
473 unsigned int mic_len)
477 ieee80211_tx_set_protected(tx);
479 skb_queue_walk(&tx->skbs, skb) {
480 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
489 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
490 unsigned int mic_len)
492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
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];
501 hdrlen = ieee80211_hdrlen(hdr->frame_control);
503 if (!ieee80211_is_data(hdr->frame_control) &&
504 !ieee80211_is_robust_mgmt_frame(skb))
507 if (status->flag & RX_FLAG_DECRYPTED) {
508 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
509 return RX_DROP_UNUSABLE;
510 if (status->flag & RX_FLAG_MIC_STRIPPED)
513 if (skb_linearize(rx->skb))
514 return RX_DROP_UNUSABLE;
517 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
518 if (!rx->sta || data_len < 0)
519 return RX_DROP_UNUSABLE;
521 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
522 ccmp_hdr2pn(pn, skb->data + hdrlen);
524 queue = rx->security_idx;
526 if (memcmp(pn, key->u.ccmp.rx_pn[queue],
527 IEEE80211_CCMP_PN_LEN) <= 0) {
528 key->u.ccmp.replays++;
529 return RX_DROP_UNUSABLE;
532 if (!(status->flag & RX_FLAG_DECRYPTED)) {
533 u8 aad[2 * AES_BLOCK_SIZE];
534 u8 b_0[AES_BLOCK_SIZE];
535 /* hardware didn't decrypt/verify MIC */
536 ccmp_special_blocks(skb, pn, b_0, aad);
538 if (ieee80211_aes_ccm_decrypt(
539 key->u.ccmp.tfm, b_0, aad,
540 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
542 skb->data + skb->len - mic_len, mic_len))
543 return RX_DROP_UNUSABLE;
546 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
549 /* Remove CCMP header and MIC */
550 if (pskb_trim(skb, skb->len - mic_len))
551 return RX_DROP_UNUSABLE;
552 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
553 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
558 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
562 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
564 memcpy(j_0, hdr->addr2, ETH_ALEN);
565 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
568 j_0[AES_BLOCK_SIZE - 1] = 0x01;
570 /* AAD (extra authenticate-only data) / masked 802.11 header
571 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
573 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
574 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
575 * Retry, PwrMgt, MoreData; set Protected
577 mask_fc = hdr->frame_control;
578 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
579 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
580 if (!ieee80211_is_mgmt(hdr->frame_control))
581 mask_fc &= ~cpu_to_le16(0x0070);
582 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
584 put_unaligned(mask_fc, (__le16 *)&aad[2]);
585 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
587 /* Mask Seq#, leave Frag# */
588 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
591 if (ieee80211_is_data_qos(hdr->frame_control))
592 qos_tid = *ieee80211_get_qos_ctl(hdr) &
593 IEEE80211_QOS_CTL_TID_MASK;
597 if (ieee80211_has_a4(hdr->frame_control)) {
598 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
602 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
607 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
612 hdr[3] = 0x20 | (key_id << 6);
619 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
629 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
631 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
632 struct ieee80211_key *key = tx->key;
633 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
634 int hdrlen, len, tail;
638 u8 aad[2 * AES_BLOCK_SIZE];
639 u8 j_0[AES_BLOCK_SIZE];
641 if (info->control.hw_key &&
642 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
643 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
644 !((info->control.hw_key->flags &
645 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
646 ieee80211_is_mgmt(hdr->frame_control))) {
647 /* hwaccel has no need for preallocated room for GCMP
648 * header or MIC fields
653 hdrlen = ieee80211_hdrlen(hdr->frame_control);
654 len = skb->len - hdrlen;
656 if (info->control.hw_key)
659 tail = IEEE80211_GCMP_MIC_LEN;
661 if (WARN_ON(skb_tailroom(skb) < tail ||
662 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
665 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
666 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
667 skb_set_network_header(skb, skb_network_offset(skb) +
668 IEEE80211_GCMP_HDR_LEN);
670 /* the HW only needs room for the IV, but not the actual IV */
671 if (info->control.hw_key &&
672 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
675 hdr = (struct ieee80211_hdr *)pos;
678 pn64 = atomic64_inc_return(&key->conf.tx_pn);
687 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
689 /* hwaccel - with software GCMP header */
690 if (info->control.hw_key)
693 pos += IEEE80211_GCMP_HDR_LEN;
694 gcmp_special_blocks(skb, pn, j_0, aad);
695 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
696 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
702 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
706 ieee80211_tx_set_protected(tx);
708 skb_queue_walk(&tx->skbs, skb) {
709 if (gcmp_encrypt_skb(tx, skb) < 0)
717 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
719 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
721 struct ieee80211_key *key = rx->key;
722 struct sk_buff *skb = rx->skb;
723 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
724 u8 pn[IEEE80211_GCMP_PN_LEN];
725 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
727 hdrlen = ieee80211_hdrlen(hdr->frame_control);
729 if (!ieee80211_is_data(hdr->frame_control) &&
730 !ieee80211_is_robust_mgmt_frame(skb))
733 if (status->flag & RX_FLAG_DECRYPTED) {
734 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
735 return RX_DROP_UNUSABLE;
736 if (status->flag & RX_FLAG_MIC_STRIPPED)
739 if (skb_linearize(rx->skb))
740 return RX_DROP_UNUSABLE;
743 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
744 if (!rx->sta || data_len < 0)
745 return RX_DROP_UNUSABLE;
747 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
748 gcmp_hdr2pn(pn, skb->data + hdrlen);
750 queue = rx->security_idx;
752 if (memcmp(pn, key->u.gcmp.rx_pn[queue],
753 IEEE80211_GCMP_PN_LEN) <= 0) {
754 key->u.gcmp.replays++;
755 return RX_DROP_UNUSABLE;
758 if (!(status->flag & RX_FLAG_DECRYPTED)) {
759 u8 aad[2 * AES_BLOCK_SIZE];
760 u8 j_0[AES_BLOCK_SIZE];
761 /* hardware didn't decrypt/verify MIC */
762 gcmp_special_blocks(skb, pn, j_0, aad);
764 if (ieee80211_aes_gcm_decrypt(
765 key->u.gcmp.tfm, j_0, aad,
766 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
768 skb->data + skb->len -
769 IEEE80211_GCMP_MIC_LEN))
770 return RX_DROP_UNUSABLE;
773 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
776 /* Remove GCMP header and MIC */
777 if (pskb_trim(skb, skb->len - mic_len))
778 return RX_DROP_UNUSABLE;
779 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
780 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
785 static ieee80211_tx_result
786 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
789 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
790 struct ieee80211_key *key = tx->key;
791 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
793 u8 *pos, iv_len = key->conf.iv_len;
795 if (info->control.hw_key &&
796 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
797 /* hwaccel has no need for preallocated head room */
801 if (unlikely(skb_headroom(skb) < iv_len &&
802 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
805 hdrlen = ieee80211_hdrlen(hdr->frame_control);
807 pos = skb_push(skb, iv_len);
808 memmove(pos, pos + iv_len, hdrlen);
813 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
817 /* pn is little endian */
818 for (i = len - 1; i >= 0; i--) {
821 else if (pn1[i] > pn2[i])
828 static ieee80211_rx_result
829 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
831 struct ieee80211_key *key = rx->key;
832 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
833 const struct ieee80211_cipher_scheme *cs = NULL;
834 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
835 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
841 if (!rx->sta || !rx->sta->cipher_scheme ||
842 !(status->flag & RX_FLAG_DECRYPTED))
843 return RX_DROP_UNUSABLE;
845 if (!ieee80211_is_data(hdr->frame_control))
848 cs = rx->sta->cipher_scheme;
850 data_len = rx->skb->len - hdrlen - cs->hdr_len;
853 return RX_DROP_UNUSABLE;
855 if (ieee80211_is_data_qos(hdr->frame_control))
856 qos_tid = *ieee80211_get_qos_ctl(hdr) &
857 IEEE80211_QOS_CTL_TID_MASK;
861 if (skb_linearize(rx->skb))
862 return RX_DROP_UNUSABLE;
864 hdr = (struct ieee80211_hdr *)rx->skb->data;
866 rx_pn = key->u.gen.rx_pn[qos_tid];
867 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
869 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
870 return RX_DROP_UNUSABLE;
872 memcpy(rx_pn, skb_pn, cs->pn_len);
874 /* remove security header and MIC */
875 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
876 return RX_DROP_UNUSABLE;
878 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
879 skb_pull(rx->skb, cs->hdr_len);
884 static void bip_aad(struct sk_buff *skb, u8 *aad)
887 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
889 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
891 /* FC type/subtype */
892 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
893 mask_fc = hdr->frame_control;
894 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
895 IEEE80211_FCTL_MOREDATA);
896 put_unaligned(mask_fc, (__le16 *) &aad[0]);
898 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
902 static inline void bip_ipn_set64(u8 *d, u64 pn)
912 static inline void bip_ipn_swap(u8 *d, const u8 *s)
924 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
927 struct ieee80211_tx_info *info;
928 struct ieee80211_key *key = tx->key;
929 struct ieee80211_mmie *mmie;
933 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
936 skb = skb_peek(&tx->skbs);
938 info = IEEE80211_SKB_CB(skb);
940 if (info->control.hw_key)
943 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
946 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
947 mmie->element_id = WLAN_EID_MMIE;
948 mmie->length = sizeof(*mmie) - 2;
949 mmie->key_id = cpu_to_le16(key->conf.keyidx);
952 pn64 = atomic64_inc_return(&key->conf.tx_pn);
954 bip_ipn_set64(mmie->sequence_number, pn64);
959 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
961 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
962 skb->data + 24, skb->len - 24, mmie->mic);
968 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
971 struct ieee80211_tx_info *info;
972 struct ieee80211_key *key = tx->key;
973 struct ieee80211_mmie_16 *mmie;
977 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
980 skb = skb_peek(&tx->skbs);
982 info = IEEE80211_SKB_CB(skb);
984 if (info->control.hw_key)
987 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
990 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
991 mmie->element_id = WLAN_EID_MMIE;
992 mmie->length = sizeof(*mmie) - 2;
993 mmie->key_id = cpu_to_le16(key->conf.keyidx);
996 pn64 = atomic64_inc_return(&key->conf.tx_pn);
998 bip_ipn_set64(mmie->sequence_number, pn64);
1002 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1004 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1005 skb->data + 24, skb->len - 24, mmie->mic);
1011 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1013 struct sk_buff *skb = rx->skb;
1014 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1015 struct ieee80211_key *key = rx->key;
1016 struct ieee80211_mmie *mmie;
1017 u8 aad[20], mic[8], ipn[6];
1018 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1020 if (!ieee80211_is_mgmt(hdr->frame_control))
1023 /* management frames are already linear */
1025 if (skb->len < 24 + sizeof(*mmie))
1026 return RX_DROP_UNUSABLE;
1028 mmie = (struct ieee80211_mmie *)
1029 (skb->data + skb->len - sizeof(*mmie));
1030 if (mmie->element_id != WLAN_EID_MMIE ||
1031 mmie->length != sizeof(*mmie) - 2)
1032 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1034 bip_ipn_swap(ipn, mmie->sequence_number);
1036 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1037 key->u.aes_cmac.replays++;
1038 return RX_DROP_UNUSABLE;
1041 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1042 /* hardware didn't decrypt/verify MIC */
1044 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1045 skb->data + 24, skb->len - 24, mic);
1046 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1047 key->u.aes_cmac.icverrors++;
1048 return RX_DROP_UNUSABLE;
1052 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1055 skb_trim(skb, skb->len - sizeof(*mmie));
1061 ieee80211_crypto_aes_cmac_256_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[20], mic[16], ipn[6];
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_UNUSABLE;
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_UNUSABLE; /* Invalid MMIE */
1084 bip_ipn_swap(ipn, mmie->sequence_number);
1086 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1087 key->u.aes_cmac.replays++;
1088 return RX_DROP_UNUSABLE;
1091 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1092 /* hardware didn't decrypt/verify MIC */
1094 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1095 skb->data + 24, skb->len - 24, mic);
1096 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1097 key->u.aes_cmac.icverrors++;
1098 return RX_DROP_UNUSABLE;
1102 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1105 skb_trim(skb, skb->len - sizeof(*mmie));
1111 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1113 struct sk_buff *skb;
1114 struct ieee80211_tx_info *info;
1115 struct ieee80211_key *key = tx->key;
1116 struct ieee80211_mmie_16 *mmie;
1117 struct ieee80211_hdr *hdr;
1122 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1125 skb = skb_peek(&tx->skbs);
1127 info = IEEE80211_SKB_CB(skb);
1129 if (info->control.hw_key)
1132 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1135 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1136 mmie->element_id = WLAN_EID_MMIE;
1137 mmie->length = sizeof(*mmie) - 2;
1138 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1141 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1143 bip_ipn_set64(mmie->sequence_number, pn64);
1147 hdr = (struct ieee80211_hdr *)skb->data;
1148 memcpy(nonce, hdr->addr2, ETH_ALEN);
1149 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1151 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1152 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1153 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1160 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1162 struct sk_buff *skb = rx->skb;
1163 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1164 struct ieee80211_key *key = rx->key;
1165 struct ieee80211_mmie_16 *mmie;
1166 u8 aad[20], mic[16], ipn[6], nonce[12];
1167 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1169 if (!ieee80211_is_mgmt(hdr->frame_control))
1172 /* management frames are already linear */
1174 if (skb->len < 24 + sizeof(*mmie))
1175 return RX_DROP_UNUSABLE;
1177 mmie = (struct ieee80211_mmie_16 *)
1178 (skb->data + skb->len - sizeof(*mmie));
1179 if (mmie->element_id != WLAN_EID_MMIE ||
1180 mmie->length != sizeof(*mmie) - 2)
1181 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1183 bip_ipn_swap(ipn, mmie->sequence_number);
1185 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1186 key->u.aes_gmac.replays++;
1187 return RX_DROP_UNUSABLE;
1190 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1191 /* hardware didn't decrypt/verify MIC */
1194 memcpy(nonce, hdr->addr2, ETH_ALEN);
1195 memcpy(nonce + ETH_ALEN, ipn, 6);
1197 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1198 skb->data + 24, skb->len - 24,
1200 memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1201 key->u.aes_gmac.icverrors++;
1202 return RX_DROP_UNUSABLE;
1206 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1209 skb_trim(skb, skb->len - sizeof(*mmie));
1215 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1217 struct sk_buff *skb;
1218 struct ieee80211_tx_info *info = NULL;
1219 ieee80211_tx_result res;
1221 skb_queue_walk(&tx->skbs, skb) {
1222 info = IEEE80211_SKB_CB(skb);
1224 /* handle hw-only algorithm */
1225 if (!info->control.hw_key)
1228 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1229 res = ieee80211_crypto_cs_encrypt(tx, skb);
1230 if (res != TX_CONTINUE)
1235 ieee80211_tx_set_protected(tx);
1241 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1243 if (rx->sta && rx->sta->cipher_scheme)
1244 return ieee80211_crypto_cs_decrypt(rx);
1246 return RX_DROP_UNUSABLE;