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>
20 #include <crypto/algapi.h>
22 #include "ieee80211_i.h"
32 ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
37 struct ieee80211_hdr *hdr;
38 struct sk_buff *skb = tx->skb;
39 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
42 hdr = (struct ieee80211_hdr *)skb->data;
43 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
44 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
47 hdrlen = ieee80211_hdrlen(hdr->frame_control);
48 if (skb->len < hdrlen)
51 data = skb->data + hdrlen;
52 data_len = skb->len - hdrlen;
54 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
55 /* Need to use software crypto for the test */
56 info->control.hw_key = NULL;
59 if (info->control.hw_key &&
60 (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
61 tx->local->ops->set_frag_threshold) &&
62 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
63 /* hwaccel - with no need for SW-generated MMIC */
67 tail = MICHAEL_MIC_LEN;
68 if (!info->control.hw_key)
69 tail += IEEE80211_TKIP_ICV_LEN;
71 if (WARN(skb_tailroom(skb) < tail ||
72 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN,
73 "mmic: not enough head/tail (%d/%d,%d/%d)\n",
74 skb_headroom(skb), IEEE80211_TKIP_IV_LEN,
75 skb_tailroom(skb), tail))
78 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
79 mic = skb_put(skb, MICHAEL_MIC_LEN);
80 michael_mic(key, hdr, data, data_len, mic);
81 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
89 ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
91 u8 *data, *key = NULL;
94 u8 mic[MICHAEL_MIC_LEN];
95 struct sk_buff *skb = rx->skb;
96 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
97 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
100 * it makes no sense to check for MIC errors on anything other
103 if (!ieee80211_is_data_present(hdr->frame_control))
107 * No way to verify the MIC if the hardware stripped it or
108 * the IV with the key index. In this case we have solely rely
109 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
110 * MIC failure report.
112 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
113 if (status->flag & RX_FLAG_MMIC_ERROR)
114 goto mic_fail_no_key;
116 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
117 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
124 * Some hardware seems to generate Michael MIC failure reports; even
125 * though, the frame was not encrypted with TKIP and therefore has no
126 * MIC. Ignore the flag them to avoid triggering countermeasures.
128 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
129 !(status->flag & RX_FLAG_DECRYPTED))
132 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
134 * APs with pairwise keys should never receive Michael MIC
135 * errors for non-zero keyidx because these are reserved for
136 * group keys and only the AP is sending real multicast
139 return RX_DROP_UNUSABLE;
142 if (status->flag & RX_FLAG_MMIC_ERROR)
145 hdrlen = ieee80211_hdrlen(hdr->frame_control);
146 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
147 return RX_DROP_UNUSABLE;
149 if (skb_linearize(rx->skb))
150 return RX_DROP_UNUSABLE;
151 hdr = (void *)skb->data;
153 data = skb->data + hdrlen;
154 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
155 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
156 michael_mic(key, hdr, data, data_len, mic);
157 if (crypto_memneq(mic, data + data_len, MICHAEL_MIC_LEN))
160 /* remove Michael MIC from payload */
161 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
164 /* update IV in key information to be able to detect replays */
165 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip.iv32;
166 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip.iv16;
171 rx->key->u.tkip.mic_failures++;
175 * In some cases the key can be unset - e.g. a multicast packet, in
176 * a driver that supports HW encryption. Send up the key idx only if
179 cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2,
180 is_multicast_ether_addr(hdr->addr1) ?
181 NL80211_KEYTYPE_GROUP :
182 NL80211_KEYTYPE_PAIRWISE,
183 rx->key ? rx->key->conf.keyidx : -1,
185 return RX_DROP_UNUSABLE;
188 static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
190 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
191 struct ieee80211_key *key = tx->key;
192 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
198 if (info->control.hw_key &&
199 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
200 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
201 /* hwaccel - with no need for software-generated IV */
205 hdrlen = ieee80211_hdrlen(hdr->frame_control);
206 len = skb->len - hdrlen;
208 if (info->control.hw_key)
211 tail = IEEE80211_TKIP_ICV_LEN;
213 if (WARN_ON(skb_tailroom(skb) < tail ||
214 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
217 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
218 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
221 /* the HW only needs room for the IV, but not the actual IV */
222 if (info->control.hw_key &&
223 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
226 /* Increase IV for the frame */
227 pn = atomic64_inc_return(&key->conf.tx_pn);
228 pos = ieee80211_tkip_add_iv(pos, &key->conf, pn);
230 /* hwaccel - with software IV */
231 if (info->control.hw_key)
234 /* Add room for ICV */
235 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
237 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
243 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
247 ieee80211_tx_set_protected(tx);
249 skb_queue_walk(&tx->skbs, skb) {
250 if (tkip_encrypt_skb(tx, skb) < 0)
259 ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
261 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
262 int hdrlen, res, hwaccel = 0;
263 struct ieee80211_key *key = rx->key;
264 struct sk_buff *skb = rx->skb;
265 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
267 hdrlen = ieee80211_hdrlen(hdr->frame_control);
269 if (!ieee80211_is_data(hdr->frame_control))
272 if (!rx->sta || skb->len - hdrlen < 12)
273 return RX_DROP_UNUSABLE;
275 /* it may be possible to optimize this a bit more */
276 if (skb_linearize(rx->skb))
277 return RX_DROP_UNUSABLE;
278 hdr = (void *)skb->data;
281 * Let TKIP code verify IV, but skip decryption.
282 * In the case where hardware checks the IV as well,
283 * we don't even get here, see ieee80211_rx_h_decrypt()
285 if (status->flag & RX_FLAG_DECRYPTED)
288 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
289 key, skb->data + hdrlen,
290 skb->len - hdrlen, rx->sta->sta.addr,
291 hdr->addr1, hwaccel, rx->security_idx,
294 if (res != TKIP_DECRYPT_OK)
295 return RX_DROP_UNUSABLE;
298 if (!(status->flag & RX_FLAG_ICV_STRIPPED))
299 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
302 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
303 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
309 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
312 int a4_included, mgmt;
316 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
319 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
320 * Retry, PwrMgt, MoreData; set Protected
322 mgmt = ieee80211_is_mgmt(hdr->frame_control);
323 mask_fc = hdr->frame_control;
324 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
325 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
327 mask_fc &= ~cpu_to_le16(0x0070);
328 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
330 hdrlen = ieee80211_hdrlen(hdr->frame_control);
332 a4_included = ieee80211_has_a4(hdr->frame_control);
334 if (ieee80211_is_data_qos(hdr->frame_control))
335 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
339 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
340 * mode authentication are not allowed to collide, yet both are derived
341 * from this vector b_0. We only set L := 1 here to indicate that the
342 * data size can be represented in (L+1) bytes. The CCM layer will take
343 * care of storing the data length in the top (L+1) bytes and setting
344 * and clearing the other bits as is required to derive the two IVs.
348 /* Nonce: Nonce Flags | A2 | PN
349 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
351 b_0[1] = qos_tid | (mgmt << 4);
352 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
353 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
355 /* AAD (extra authenticate-only data) / masked 802.11 header
356 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
357 put_unaligned_be16(len_a, &aad[0]);
358 put_unaligned(mask_fc, (__le16 *)&aad[2]);
359 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
361 /* Mask Seq#, leave Frag# */
362 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
366 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
370 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
376 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
381 hdr[3] = 0x20 | (key_id << 6);
389 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
400 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
401 unsigned int mic_len)
403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
404 struct ieee80211_key *key = tx->key;
405 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
406 int hdrlen, len, tail;
411 u8 b_0[AES_BLOCK_SIZE];
413 if (info->control.hw_key &&
414 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
415 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
416 !((info->control.hw_key->flags &
417 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
418 ieee80211_is_mgmt(hdr->frame_control))) {
420 * hwaccel has no need for preallocated room for CCMP
421 * header or MIC fields
426 hdrlen = ieee80211_hdrlen(hdr->frame_control);
427 len = skb->len - hdrlen;
429 if (info->control.hw_key)
434 if (WARN_ON(skb_tailroom(skb) < tail ||
435 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
438 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
439 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
441 /* the HW only needs room for the IV, but not the actual IV */
442 if (info->control.hw_key &&
443 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
446 hdr = (struct ieee80211_hdr *) pos;
449 pn64 = atomic64_inc_return(&key->conf.tx_pn);
458 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
460 /* hwaccel - with software CCMP header */
461 if (info->control.hw_key)
464 pos += IEEE80211_CCMP_HDR_LEN;
465 ccmp_special_blocks(skb, pn, b_0, aad);
466 return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
467 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)) {
524 ccmp_hdr2pn(pn, skb->data + hdrlen);
526 queue = rx->security_idx;
528 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
529 IEEE80211_CCMP_PN_LEN);
531 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
532 key->u.ccmp.replays++;
533 return RX_DROP_UNUSABLE;
536 if (!(status->flag & RX_FLAG_DECRYPTED)) {
537 u8 aad[2 * AES_BLOCK_SIZE];
538 u8 b_0[AES_BLOCK_SIZE];
539 /* hardware didn't decrypt/verify MIC */
540 ccmp_special_blocks(skb, pn, b_0, aad);
542 if (ieee80211_aes_ccm_decrypt(
543 key->u.ccmp.tfm, b_0, aad,
544 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
546 skb->data + skb->len - mic_len, mic_len))
547 return RX_DROP_UNUSABLE;
550 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
551 if (unlikely(ieee80211_is_frag(hdr)))
552 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
555 /* Remove CCMP header and MIC */
556 if (pskb_trim(skb, skb->len - mic_len))
557 return RX_DROP_UNUSABLE;
558 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
559 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
564 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
568 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
570 memcpy(j_0, hdr->addr2, ETH_ALEN);
571 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
574 j_0[AES_BLOCK_SIZE - 1] = 0x01;
576 /* AAD (extra authenticate-only data) / masked 802.11 header
577 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
579 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
580 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
581 * Retry, PwrMgt, MoreData; set Protected
583 mask_fc = hdr->frame_control;
584 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
585 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
586 if (!ieee80211_is_mgmt(hdr->frame_control))
587 mask_fc &= ~cpu_to_le16(0x0070);
588 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
590 put_unaligned(mask_fc, (__le16 *)&aad[2]);
591 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
593 /* Mask Seq#, leave Frag# */
594 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
597 if (ieee80211_is_data_qos(hdr->frame_control))
598 qos_tid = *ieee80211_get_qos_ctl(hdr) &
599 IEEE80211_QOS_CTL_TID_MASK;
603 if (ieee80211_has_a4(hdr->frame_control)) {
604 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
608 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
613 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
618 hdr[3] = 0x20 | (key_id << 6);
625 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
635 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
637 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
638 struct ieee80211_key *key = tx->key;
639 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
640 int hdrlen, len, tail;
645 u8 j_0[AES_BLOCK_SIZE];
647 if (info->control.hw_key &&
648 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
649 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
650 !((info->control.hw_key->flags &
651 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
652 ieee80211_is_mgmt(hdr->frame_control))) {
653 /* hwaccel has no need for preallocated room for GCMP
654 * header or MIC fields
659 hdrlen = ieee80211_hdrlen(hdr->frame_control);
660 len = skb->len - hdrlen;
662 if (info->control.hw_key)
665 tail = IEEE80211_GCMP_MIC_LEN;
667 if (WARN_ON(skb_tailroom(skb) < tail ||
668 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
671 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
672 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
673 skb_set_network_header(skb, skb_network_offset(skb) +
674 IEEE80211_GCMP_HDR_LEN);
676 /* the HW only needs room for the IV, but not the actual IV */
677 if (info->control.hw_key &&
678 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
681 hdr = (struct ieee80211_hdr *)pos;
684 pn64 = atomic64_inc_return(&key->conf.tx_pn);
693 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
695 /* hwaccel - with software GCMP header */
696 if (info->control.hw_key)
699 pos += IEEE80211_GCMP_HDR_LEN;
700 gcmp_special_blocks(skb, pn, j_0, aad);
701 return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
702 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
706 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
710 ieee80211_tx_set_protected(tx);
712 skb_queue_walk(&tx->skbs, skb) {
713 if (gcmp_encrypt_skb(tx, skb) < 0)
721 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
723 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
725 struct ieee80211_key *key = rx->key;
726 struct sk_buff *skb = rx->skb;
727 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
728 u8 pn[IEEE80211_GCMP_PN_LEN];
729 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
731 hdrlen = ieee80211_hdrlen(hdr->frame_control);
733 if (!ieee80211_is_data(hdr->frame_control) &&
734 !ieee80211_is_robust_mgmt_frame(skb))
737 if (status->flag & RX_FLAG_DECRYPTED) {
738 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
739 return RX_DROP_UNUSABLE;
740 if (status->flag & RX_FLAG_MIC_STRIPPED)
743 if (skb_linearize(rx->skb))
744 return RX_DROP_UNUSABLE;
747 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
748 if (!rx->sta || data_len < 0)
749 return RX_DROP_UNUSABLE;
751 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
754 gcmp_hdr2pn(pn, skb->data + hdrlen);
756 queue = rx->security_idx;
758 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
759 IEEE80211_GCMP_PN_LEN);
761 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
762 key->u.gcmp.replays++;
763 return RX_DROP_UNUSABLE;
766 if (!(status->flag & RX_FLAG_DECRYPTED)) {
767 u8 aad[2 * AES_BLOCK_SIZE];
768 u8 j_0[AES_BLOCK_SIZE];
769 /* hardware didn't decrypt/verify MIC */
770 gcmp_special_blocks(skb, pn, j_0, aad);
772 if (ieee80211_aes_gcm_decrypt(
773 key->u.gcmp.tfm, j_0, aad,
774 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
776 skb->data + skb->len -
777 IEEE80211_GCMP_MIC_LEN))
778 return RX_DROP_UNUSABLE;
781 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
782 if (unlikely(ieee80211_is_frag(hdr)))
783 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
786 /* Remove GCMP header and MIC */
787 if (pskb_trim(skb, skb->len - mic_len))
788 return RX_DROP_UNUSABLE;
789 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
790 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
795 static ieee80211_tx_result
796 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
800 struct ieee80211_key *key = tx->key;
801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
803 u8 *pos, iv_len = key->conf.iv_len;
805 if (info->control.hw_key &&
806 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
807 /* hwaccel has no need for preallocated head room */
811 if (unlikely(skb_headroom(skb) < iv_len &&
812 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
815 hdrlen = ieee80211_hdrlen(hdr->frame_control);
817 pos = skb_push(skb, iv_len);
818 memmove(pos, pos + iv_len, hdrlen);
823 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
827 /* pn is little endian */
828 for (i = len - 1; i >= 0; i--) {
831 else if (pn1[i] > pn2[i])
838 static ieee80211_rx_result
839 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
841 struct ieee80211_key *key = rx->key;
842 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
843 const struct ieee80211_cipher_scheme *cs = NULL;
844 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
845 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
851 if (!rx->sta || !rx->sta->cipher_scheme ||
852 !(status->flag & RX_FLAG_DECRYPTED))
853 return RX_DROP_UNUSABLE;
855 if (!ieee80211_is_data(hdr->frame_control))
858 cs = rx->sta->cipher_scheme;
860 data_len = rx->skb->len - hdrlen - cs->hdr_len;
863 return RX_DROP_UNUSABLE;
865 if (ieee80211_is_data_qos(hdr->frame_control))
866 qos_tid = *ieee80211_get_qos_ctl(hdr) &
867 IEEE80211_QOS_CTL_TID_MASK;
871 if (skb_linearize(rx->skb))
872 return RX_DROP_UNUSABLE;
874 hdr = (struct ieee80211_hdr *)rx->skb->data;
876 rx_pn = key->u.gen.rx_pn[qos_tid];
877 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
879 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
880 return RX_DROP_UNUSABLE;
882 memcpy(rx_pn, skb_pn, cs->pn_len);
884 /* remove security header and MIC */
885 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
886 return RX_DROP_UNUSABLE;
888 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
889 skb_pull(rx->skb, cs->hdr_len);
894 static void bip_aad(struct sk_buff *skb, u8 *aad)
897 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
899 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
901 /* FC type/subtype */
902 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
903 mask_fc = hdr->frame_control;
904 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
905 IEEE80211_FCTL_MOREDATA);
906 put_unaligned(mask_fc, (__le16 *) &aad[0]);
908 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
912 static inline void bip_ipn_set64(u8 *d, u64 pn)
922 static inline void bip_ipn_swap(u8 *d, const u8 *s)
934 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
937 struct ieee80211_tx_info *info;
938 struct ieee80211_key *key = tx->key;
939 struct ieee80211_mmie *mmie;
943 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
946 skb = skb_peek(&tx->skbs);
948 info = IEEE80211_SKB_CB(skb);
950 if (info->control.hw_key)
953 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
956 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
957 mmie->element_id = WLAN_EID_MMIE;
958 mmie->length = sizeof(*mmie) - 2;
959 mmie->key_id = cpu_to_le16(key->conf.keyidx);
962 pn64 = atomic64_inc_return(&key->conf.tx_pn);
964 bip_ipn_set64(mmie->sequence_number, pn64);
969 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
971 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
972 skb->data + 24, skb->len - 24, mmie->mic);
978 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
981 struct ieee80211_tx_info *info;
982 struct ieee80211_key *key = tx->key;
983 struct ieee80211_mmie_16 *mmie;
987 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
990 skb = skb_peek(&tx->skbs);
992 info = IEEE80211_SKB_CB(skb);
994 if (info->control.hw_key)
997 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1000 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1001 mmie->element_id = WLAN_EID_MMIE;
1002 mmie->length = sizeof(*mmie) - 2;
1003 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1006 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1008 bip_ipn_set64(mmie->sequence_number, pn64);
1012 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1014 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1015 skb->data + 24, skb->len - 24, mmie->mic);
1021 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1023 struct sk_buff *skb = rx->skb;
1024 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1025 struct ieee80211_key *key = rx->key;
1026 struct ieee80211_mmie *mmie;
1027 u8 aad[20], mic[8], ipn[6];
1028 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1030 if (!ieee80211_is_mgmt(hdr->frame_control))
1033 /* management frames are already linear */
1035 if (skb->len < 24 + sizeof(*mmie))
1036 return RX_DROP_UNUSABLE;
1038 mmie = (struct ieee80211_mmie *)
1039 (skb->data + skb->len - sizeof(*mmie));
1040 if (mmie->element_id != WLAN_EID_MMIE ||
1041 mmie->length != sizeof(*mmie) - 2)
1042 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1044 bip_ipn_swap(ipn, mmie->sequence_number);
1046 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1047 key->u.aes_cmac.replays++;
1048 return RX_DROP_UNUSABLE;
1051 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1052 /* hardware didn't decrypt/verify MIC */
1054 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1055 skb->data + 24, skb->len - 24, mic);
1056 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1057 key->u.aes_cmac.icverrors++;
1058 return RX_DROP_UNUSABLE;
1062 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1065 skb_trim(skb, skb->len - sizeof(*mmie));
1071 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1073 struct sk_buff *skb = rx->skb;
1074 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1075 struct ieee80211_key *key = rx->key;
1076 struct ieee80211_mmie_16 *mmie;
1077 u8 aad[20], mic[16], ipn[6];
1078 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1080 if (!ieee80211_is_mgmt(hdr->frame_control))
1083 /* management frames are already linear */
1085 if (skb->len < 24 + sizeof(*mmie))
1086 return RX_DROP_UNUSABLE;
1088 mmie = (struct ieee80211_mmie_16 *)
1089 (skb->data + skb->len - sizeof(*mmie));
1090 if (mmie->element_id != WLAN_EID_MMIE ||
1091 mmie->length != sizeof(*mmie) - 2)
1092 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1094 bip_ipn_swap(ipn, mmie->sequence_number);
1096 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1097 key->u.aes_cmac.replays++;
1098 return RX_DROP_UNUSABLE;
1101 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1102 /* hardware didn't decrypt/verify MIC */
1104 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1105 skb->data + 24, skb->len - 24, mic);
1106 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1107 key->u.aes_cmac.icverrors++;
1108 return RX_DROP_UNUSABLE;
1112 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1115 skb_trim(skb, skb->len - sizeof(*mmie));
1121 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1123 struct sk_buff *skb;
1124 struct ieee80211_tx_info *info;
1125 struct ieee80211_key *key = tx->key;
1126 struct ieee80211_mmie_16 *mmie;
1127 struct ieee80211_hdr *hdr;
1128 u8 aad[GMAC_AAD_LEN];
1130 u8 nonce[GMAC_NONCE_LEN];
1132 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1135 skb = skb_peek(&tx->skbs);
1137 info = IEEE80211_SKB_CB(skb);
1139 if (info->control.hw_key)
1142 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1145 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1146 mmie->element_id = WLAN_EID_MMIE;
1147 mmie->length = sizeof(*mmie) - 2;
1148 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1151 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1153 bip_ipn_set64(mmie->sequence_number, pn64);
1157 hdr = (struct ieee80211_hdr *)skb->data;
1158 memcpy(nonce, hdr->addr2, ETH_ALEN);
1159 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1161 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1162 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1163 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1170 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1172 struct sk_buff *skb = rx->skb;
1173 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1174 struct ieee80211_key *key = rx->key;
1175 struct ieee80211_mmie_16 *mmie;
1176 u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN];
1177 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1179 if (!ieee80211_is_mgmt(hdr->frame_control))
1182 /* management frames are already linear */
1184 if (skb->len < 24 + sizeof(*mmie))
1185 return RX_DROP_UNUSABLE;
1187 mmie = (struct ieee80211_mmie_16 *)
1188 (skb->data + skb->len - sizeof(*mmie));
1189 if (mmie->element_id != WLAN_EID_MMIE ||
1190 mmie->length != sizeof(*mmie) - 2)
1191 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1193 bip_ipn_swap(ipn, mmie->sequence_number);
1195 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1196 key->u.aes_gmac.replays++;
1197 return RX_DROP_UNUSABLE;
1200 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1201 /* hardware didn't decrypt/verify MIC */
1204 memcpy(nonce, hdr->addr2, ETH_ALEN);
1205 memcpy(nonce + ETH_ALEN, ipn, 6);
1207 mic = kmalloc(GMAC_MIC_LEN, GFP_ATOMIC);
1209 return RX_DROP_UNUSABLE;
1210 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1211 skb->data + 24, skb->len - 24,
1213 crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1214 key->u.aes_gmac.icverrors++;
1216 return RX_DROP_UNUSABLE;
1221 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1224 skb_trim(skb, skb->len - sizeof(*mmie));
1230 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1232 struct sk_buff *skb;
1233 struct ieee80211_tx_info *info = NULL;
1234 ieee80211_tx_result res;
1236 skb_queue_walk(&tx->skbs, skb) {
1237 info = IEEE80211_SKB_CB(skb);
1239 /* handle hw-only algorithm */
1240 if (!info->control.hw_key)
1243 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1244 res = ieee80211_crypto_cs_encrypt(tx, skb);
1245 if (res != TX_CONTINUE)
1250 ieee80211_tx_set_protected(tx);
1256 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1258 if (rx->sta && rx->sta->cipher_scheme)
1259 return ieee80211_crypto_cs_decrypt(rx);
1261 return RX_DROP_UNUSABLE;