2 * Copyright 2002-2004, Instant802 Networks, Inc.
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 ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) &&
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 if (!(status->flag & RX_FLAG_ICV_STRIPPED))
298 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
301 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
302 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
308 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
311 int a4_included, mgmt;
315 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
318 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
319 * Retry, PwrMgt, MoreData; set Protected
321 mgmt = ieee80211_is_mgmt(hdr->frame_control);
322 mask_fc = hdr->frame_control;
323 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
324 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
326 mask_fc &= ~cpu_to_le16(0x0070);
327 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
329 hdrlen = ieee80211_hdrlen(hdr->frame_control);
331 a4_included = ieee80211_has_a4(hdr->frame_control);
333 if (ieee80211_is_data_qos(hdr->frame_control))
334 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
338 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
339 * mode authentication are not allowed to collide, yet both are derived
340 * from this vector b_0. We only set L := 1 here to indicate that the
341 * data size can be represented in (L+1) bytes. The CCM layer will take
342 * care of storing the data length in the top (L+1) bytes and setting
343 * and clearing the other bits as is required to derive the two IVs.
347 /* Nonce: Nonce Flags | A2 | PN
348 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
350 b_0[1] = qos_tid | (mgmt << 4);
351 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
352 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
354 /* AAD (extra authenticate-only data) / masked 802.11 header
355 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
356 put_unaligned_be16(len_a, &aad[0]);
357 put_unaligned(mask_fc, (__le16 *)&aad[2]);
358 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
360 /* Mask Seq#, leave Frag# */
361 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
365 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
369 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
375 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
380 hdr[3] = 0x20 | (key_id << 6);
388 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
399 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
400 unsigned int mic_len)
402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
403 struct ieee80211_key *key = tx->key;
404 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
405 int hdrlen, len, tail;
410 u8 b_0[AES_BLOCK_SIZE];
412 if (info->control.hw_key &&
413 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
414 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
415 !((info->control.hw_key->flags &
416 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
417 ieee80211_is_mgmt(hdr->frame_control))) {
419 * hwaccel has no need for preallocated room for CCMP
420 * header or MIC fields
425 hdrlen = ieee80211_hdrlen(hdr->frame_control);
426 len = skb->len - hdrlen;
428 if (info->control.hw_key)
433 if (WARN_ON(skb_tailroom(skb) < tail ||
434 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
437 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
438 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
440 /* the HW only needs room for the IV, but not the actual IV */
441 if (info->control.hw_key &&
442 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
445 hdr = (struct ieee80211_hdr *) pos;
448 pn64 = atomic64_inc_return(&key->conf.tx_pn);
457 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
459 /* hwaccel - with software CCMP header */
460 if (info->control.hw_key)
463 pos += IEEE80211_CCMP_HDR_LEN;
464 ccmp_special_blocks(skb, pn, b_0, aad);
465 return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
466 skb_put(skb, mic_len), mic_len);
471 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
472 unsigned int mic_len)
476 ieee80211_tx_set_protected(tx);
478 skb_queue_walk(&tx->skbs, skb) {
479 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
488 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
489 unsigned int mic_len)
491 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
493 struct ieee80211_key *key = rx->key;
494 struct sk_buff *skb = rx->skb;
495 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
496 u8 pn[IEEE80211_CCMP_PN_LEN];
500 hdrlen = ieee80211_hdrlen(hdr->frame_control);
502 if (!ieee80211_is_data(hdr->frame_control) &&
503 !ieee80211_is_robust_mgmt_frame(skb))
506 if (status->flag & RX_FLAG_DECRYPTED) {
507 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
508 return RX_DROP_UNUSABLE;
509 if (status->flag & RX_FLAG_MIC_STRIPPED)
512 if (skb_linearize(rx->skb))
513 return RX_DROP_UNUSABLE;
516 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
517 if (!rx->sta || data_len < 0)
518 return RX_DROP_UNUSABLE;
520 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
523 ccmp_hdr2pn(pn, skb->data + hdrlen);
525 queue = rx->security_idx;
527 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
528 IEEE80211_CCMP_PN_LEN);
530 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
531 key->u.ccmp.replays++;
532 return RX_DROP_UNUSABLE;
535 if (!(status->flag & RX_FLAG_DECRYPTED)) {
536 u8 aad[2 * AES_BLOCK_SIZE];
537 u8 b_0[AES_BLOCK_SIZE];
538 /* hardware didn't decrypt/verify MIC */
539 ccmp_special_blocks(skb, pn, b_0, aad);
541 if (ieee80211_aes_ccm_decrypt(
542 key->u.ccmp.tfm, b_0, aad,
543 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
545 skb->data + skb->len - mic_len, mic_len))
546 return RX_DROP_UNUSABLE;
549 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
552 /* Remove CCMP header and MIC */
553 if (pskb_trim(skb, skb->len - mic_len))
554 return RX_DROP_UNUSABLE;
555 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
556 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
561 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
565 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
567 memcpy(j_0, hdr->addr2, ETH_ALEN);
568 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
571 j_0[AES_BLOCK_SIZE - 1] = 0x01;
573 /* AAD (extra authenticate-only data) / masked 802.11 header
574 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
576 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
577 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
578 * Retry, PwrMgt, MoreData; set Protected
580 mask_fc = hdr->frame_control;
581 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
582 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
583 if (!ieee80211_is_mgmt(hdr->frame_control))
584 mask_fc &= ~cpu_to_le16(0x0070);
585 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
587 put_unaligned(mask_fc, (__le16 *)&aad[2]);
588 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
590 /* Mask Seq#, leave Frag# */
591 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
594 if (ieee80211_is_data_qos(hdr->frame_control))
595 qos_tid = *ieee80211_get_qos_ctl(hdr) &
596 IEEE80211_QOS_CTL_TID_MASK;
600 if (ieee80211_has_a4(hdr->frame_control)) {
601 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
605 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
610 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
615 hdr[3] = 0x20 | (key_id << 6);
622 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
632 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
634 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
635 struct ieee80211_key *key = tx->key;
636 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
637 int hdrlen, len, tail;
642 u8 j_0[AES_BLOCK_SIZE];
644 if (info->control.hw_key &&
645 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
646 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
647 !((info->control.hw_key->flags &
648 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
649 ieee80211_is_mgmt(hdr->frame_control))) {
650 /* hwaccel has no need for preallocated room for GCMP
651 * header or MIC fields
656 hdrlen = ieee80211_hdrlen(hdr->frame_control);
657 len = skb->len - hdrlen;
659 if (info->control.hw_key)
662 tail = IEEE80211_GCMP_MIC_LEN;
664 if (WARN_ON(skb_tailroom(skb) < tail ||
665 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
668 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
669 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
670 skb_set_network_header(skb, skb_network_offset(skb) +
671 IEEE80211_GCMP_HDR_LEN);
673 /* the HW only needs room for the IV, but not the actual IV */
674 if (info->control.hw_key &&
675 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
678 hdr = (struct ieee80211_hdr *)pos;
681 pn64 = atomic64_inc_return(&key->conf.tx_pn);
690 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
692 /* hwaccel - with software GCMP header */
693 if (info->control.hw_key)
696 pos += IEEE80211_GCMP_HDR_LEN;
697 gcmp_special_blocks(skb, pn, j_0, aad);
698 return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
699 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
703 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
707 ieee80211_tx_set_protected(tx);
709 skb_queue_walk(&tx->skbs, skb) {
710 if (gcmp_encrypt_skb(tx, skb) < 0)
718 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
720 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
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, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
728 hdrlen = ieee80211_hdrlen(hdr->frame_control);
730 if (!ieee80211_is_data(hdr->frame_control) &&
731 !ieee80211_is_robust_mgmt_frame(skb))
734 if (status->flag & RX_FLAG_DECRYPTED) {
735 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
736 return RX_DROP_UNUSABLE;
737 if (status->flag & RX_FLAG_MIC_STRIPPED)
740 if (skb_linearize(rx->skb))
741 return RX_DROP_UNUSABLE;
744 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
745 if (!rx->sta || data_len < 0)
746 return RX_DROP_UNUSABLE;
748 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
751 gcmp_hdr2pn(pn, skb->data + hdrlen);
753 queue = rx->security_idx;
755 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
756 IEEE80211_GCMP_PN_LEN);
758 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
759 key->u.gcmp.replays++;
760 return RX_DROP_UNUSABLE;
763 if (!(status->flag & RX_FLAG_DECRYPTED)) {
764 u8 aad[2 * AES_BLOCK_SIZE];
765 u8 j_0[AES_BLOCK_SIZE];
766 /* hardware didn't decrypt/verify MIC */
767 gcmp_special_blocks(skb, pn, j_0, aad);
769 if (ieee80211_aes_gcm_decrypt(
770 key->u.gcmp.tfm, j_0, aad,
771 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
773 skb->data + skb->len -
774 IEEE80211_GCMP_MIC_LEN))
775 return RX_DROP_UNUSABLE;
778 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
781 /* Remove GCMP header and MIC */
782 if (pskb_trim(skb, skb->len - mic_len))
783 return RX_DROP_UNUSABLE;
784 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
785 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
790 static ieee80211_tx_result
791 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
794 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
795 struct ieee80211_key *key = tx->key;
796 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
798 u8 *pos, iv_len = key->conf.iv_len;
800 if (info->control.hw_key &&
801 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
802 /* hwaccel has no need for preallocated head room */
806 if (unlikely(skb_headroom(skb) < iv_len &&
807 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
810 hdrlen = ieee80211_hdrlen(hdr->frame_control);
812 pos = skb_push(skb, iv_len);
813 memmove(pos, pos + iv_len, hdrlen);
818 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
822 /* pn is little endian */
823 for (i = len - 1; i >= 0; i--) {
826 else if (pn1[i] > pn2[i])
833 static ieee80211_rx_result
834 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
836 struct ieee80211_key *key = rx->key;
837 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
838 const struct ieee80211_cipher_scheme *cs = NULL;
839 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
840 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
846 if (!rx->sta || !rx->sta->cipher_scheme ||
847 !(status->flag & RX_FLAG_DECRYPTED))
848 return RX_DROP_UNUSABLE;
850 if (!ieee80211_is_data(hdr->frame_control))
853 cs = rx->sta->cipher_scheme;
855 data_len = rx->skb->len - hdrlen - cs->hdr_len;
858 return RX_DROP_UNUSABLE;
860 if (ieee80211_is_data_qos(hdr->frame_control))
861 qos_tid = *ieee80211_get_qos_ctl(hdr) &
862 IEEE80211_QOS_CTL_TID_MASK;
866 if (skb_linearize(rx->skb))
867 return RX_DROP_UNUSABLE;
869 hdr = (struct ieee80211_hdr *)rx->skb->data;
871 rx_pn = key->u.gen.rx_pn[qos_tid];
872 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
874 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
875 return RX_DROP_UNUSABLE;
877 memcpy(rx_pn, skb_pn, cs->pn_len);
879 /* remove security header and MIC */
880 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
881 return RX_DROP_UNUSABLE;
883 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
884 skb_pull(rx->skb, cs->hdr_len);
889 static void bip_aad(struct sk_buff *skb, u8 *aad)
892 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
894 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
896 /* FC type/subtype */
897 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
898 mask_fc = hdr->frame_control;
899 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
900 IEEE80211_FCTL_MOREDATA);
901 put_unaligned(mask_fc, (__le16 *) &aad[0]);
903 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
907 static inline void bip_ipn_set64(u8 *d, u64 pn)
917 static inline void bip_ipn_swap(u8 *d, const u8 *s)
929 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
932 struct ieee80211_tx_info *info;
933 struct ieee80211_key *key = tx->key;
934 struct ieee80211_mmie *mmie;
938 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
941 skb = skb_peek(&tx->skbs);
943 info = IEEE80211_SKB_CB(skb);
945 if (info->control.hw_key)
948 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
951 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
952 mmie->element_id = WLAN_EID_MMIE;
953 mmie->length = sizeof(*mmie) - 2;
954 mmie->key_id = cpu_to_le16(key->conf.keyidx);
957 pn64 = atomic64_inc_return(&key->conf.tx_pn);
959 bip_ipn_set64(mmie->sequence_number, pn64);
964 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
966 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
967 skb->data + 24, skb->len - 24, mmie->mic);
973 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
976 struct ieee80211_tx_info *info;
977 struct ieee80211_key *key = tx->key;
978 struct ieee80211_mmie_16 *mmie;
982 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
985 skb = skb_peek(&tx->skbs);
987 info = IEEE80211_SKB_CB(skb);
989 if (info->control.hw_key)
992 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
995 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
996 mmie->element_id = WLAN_EID_MMIE;
997 mmie->length = sizeof(*mmie) - 2;
998 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1001 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1003 bip_ipn_set64(mmie->sequence_number, pn64);
1007 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1009 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1010 skb->data + 24, skb->len - 24, mmie->mic);
1016 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1018 struct sk_buff *skb = rx->skb;
1019 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1020 struct ieee80211_key *key = rx->key;
1021 struct ieee80211_mmie *mmie;
1022 u8 aad[20], mic[8], ipn[6];
1023 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1025 if (!ieee80211_is_mgmt(hdr->frame_control))
1028 /* management frames are already linear */
1030 if (skb->len < 24 + sizeof(*mmie))
1031 return RX_DROP_UNUSABLE;
1033 mmie = (struct ieee80211_mmie *)
1034 (skb->data + skb->len - sizeof(*mmie));
1035 if (mmie->element_id != WLAN_EID_MMIE ||
1036 mmie->length != sizeof(*mmie) - 2)
1037 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1039 bip_ipn_swap(ipn, mmie->sequence_number);
1041 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1042 key->u.aes_cmac.replays++;
1043 return RX_DROP_UNUSABLE;
1046 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1047 /* hardware didn't decrypt/verify MIC */
1049 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1050 skb->data + 24, skb->len - 24, mic);
1051 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1052 key->u.aes_cmac.icverrors++;
1053 return RX_DROP_UNUSABLE;
1057 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1060 skb_trim(skb, skb->len - sizeof(*mmie));
1066 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1068 struct sk_buff *skb = rx->skb;
1069 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1070 struct ieee80211_key *key = rx->key;
1071 struct ieee80211_mmie_16 *mmie;
1072 u8 aad[20], mic[16], ipn[6];
1073 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1075 if (!ieee80211_is_mgmt(hdr->frame_control))
1078 /* management frames are already linear */
1080 if (skb->len < 24 + sizeof(*mmie))
1081 return RX_DROP_UNUSABLE;
1083 mmie = (struct ieee80211_mmie_16 *)
1084 (skb->data + skb->len - sizeof(*mmie));
1085 if (mmie->element_id != WLAN_EID_MMIE ||
1086 mmie->length != sizeof(*mmie) - 2)
1087 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1089 bip_ipn_swap(ipn, mmie->sequence_number);
1091 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1092 key->u.aes_cmac.replays++;
1093 return RX_DROP_UNUSABLE;
1096 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1097 /* hardware didn't decrypt/verify MIC */
1099 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1100 skb->data + 24, skb->len - 24, mic);
1101 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1102 key->u.aes_cmac.icverrors++;
1103 return RX_DROP_UNUSABLE;
1107 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1110 skb_trim(skb, skb->len - sizeof(*mmie));
1116 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1118 struct sk_buff *skb;
1119 struct ieee80211_tx_info *info;
1120 struct ieee80211_key *key = tx->key;
1121 struct ieee80211_mmie_16 *mmie;
1122 struct ieee80211_hdr *hdr;
1123 u8 aad[GMAC_AAD_LEN];
1125 u8 nonce[GMAC_NONCE_LEN];
1127 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1130 skb = skb_peek(&tx->skbs);
1132 info = IEEE80211_SKB_CB(skb);
1134 if (info->control.hw_key)
1137 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1140 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1141 mmie->element_id = WLAN_EID_MMIE;
1142 mmie->length = sizeof(*mmie) - 2;
1143 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1146 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1148 bip_ipn_set64(mmie->sequence_number, pn64);
1152 hdr = (struct ieee80211_hdr *)skb->data;
1153 memcpy(nonce, hdr->addr2, ETH_ALEN);
1154 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1156 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1157 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1158 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1165 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1167 struct sk_buff *skb = rx->skb;
1168 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1169 struct ieee80211_key *key = rx->key;
1170 struct ieee80211_mmie_16 *mmie;
1171 u8 aad[GMAC_AAD_LEN], mic[GMAC_MIC_LEN], ipn[6], nonce[GMAC_NONCE_LEN];
1172 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1174 if (!ieee80211_is_mgmt(hdr->frame_control))
1177 /* management frames are already linear */
1179 if (skb->len < 24 + sizeof(*mmie))
1180 return RX_DROP_UNUSABLE;
1182 mmie = (struct ieee80211_mmie_16 *)
1183 (skb->data + skb->len - sizeof(*mmie));
1184 if (mmie->element_id != WLAN_EID_MMIE ||
1185 mmie->length != sizeof(*mmie) - 2)
1186 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1188 bip_ipn_swap(ipn, mmie->sequence_number);
1190 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1191 key->u.aes_gmac.replays++;
1192 return RX_DROP_UNUSABLE;
1195 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1196 /* hardware didn't decrypt/verify MIC */
1199 memcpy(nonce, hdr->addr2, ETH_ALEN);
1200 memcpy(nonce + ETH_ALEN, ipn, 6);
1202 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1203 skb->data + 24, skb->len - 24,
1205 memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1206 key->u.aes_gmac.icverrors++;
1207 return RX_DROP_UNUSABLE;
1211 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1214 skb_trim(skb, skb->len - sizeof(*mmie));
1220 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1222 struct sk_buff *skb;
1223 struct ieee80211_tx_info *info = NULL;
1224 ieee80211_tx_result res;
1226 skb_queue_walk(&tx->skbs, skb) {
1227 info = IEEE80211_SKB_CB(skb);
1229 /* handle hw-only algorithm */
1230 if (!info->control.hw_key)
1233 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1234 res = ieee80211_crypto_cs_encrypt(tx, skb);
1235 if (res != TX_CONTINUE)
1240 ieee80211_tx_set_protected(tx);
1246 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1248 if (rx->sta && rx->sta->cipher_scheme)
1249 return ieee80211_crypto_cs_decrypt(rx);
1251 return RX_DROP_UNUSABLE;