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) 2020-2021 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/algapi.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_UNUSABLE;
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_UNUSABLE;
155 if (skb_linearize(rx->skb))
156 return RX_DROP_UNUSABLE;
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_UNUSABLE;
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_UNUSABLE;
281 /* it may be possible to optimize this a bit more */
282 if (skb_linearize(rx->skb))
283 return RX_DROP_UNUSABLE;
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_UNUSABLE;
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 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
318 int a4_included, mgmt;
322 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
325 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
326 * Retry, PwrMgt, MoreData; set Protected
328 mgmt = ieee80211_is_mgmt(hdr->frame_control);
329 mask_fc = hdr->frame_control;
330 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
331 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
333 mask_fc &= ~cpu_to_le16(0x0070);
334 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
336 hdrlen = ieee80211_hdrlen(hdr->frame_control);
338 a4_included = ieee80211_has_a4(hdr->frame_control);
340 if (ieee80211_is_data_qos(hdr->frame_control))
341 qos_tid = ieee80211_get_tid(hdr);
345 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
346 * mode authentication are not allowed to collide, yet both are derived
347 * from this vector b_0. We only set L := 1 here to indicate that the
348 * data size can be represented in (L+1) bytes. The CCM layer will take
349 * care of storing the data length in the top (L+1) bytes and setting
350 * and clearing the other bits as is required to derive the two IVs.
354 /* Nonce: Nonce Flags | A2 | PN
355 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
357 b_0[1] = qos_tid | (mgmt << 4);
358 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
359 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
361 /* AAD (extra authenticate-only data) / masked 802.11 header
362 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
363 put_unaligned_be16(len_a, &aad[0]);
364 put_unaligned(mask_fc, (__le16 *)&aad[2]);
365 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
367 /* Mask Seq#, leave Frag# */
368 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
372 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
376 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
382 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
387 hdr[3] = 0x20 | (key_id << 6);
395 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
406 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
407 unsigned int mic_len)
409 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
410 struct ieee80211_key *key = tx->key;
411 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
412 int hdrlen, len, tail;
417 u8 b_0[AES_BLOCK_SIZE];
419 if (info->control.hw_key &&
420 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
421 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
422 !((info->control.hw_key->flags &
423 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
424 ieee80211_is_mgmt(hdr->frame_control))) {
426 * hwaccel has no need for preallocated room for CCMP
427 * header or MIC fields
432 hdrlen = ieee80211_hdrlen(hdr->frame_control);
433 len = skb->len - hdrlen;
435 if (info->control.hw_key)
440 if (WARN_ON(skb_tailroom(skb) < tail ||
441 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
444 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
445 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
447 /* the HW only needs room for the IV, but not the actual IV */
448 if (info->control.hw_key &&
449 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
452 hdr = (struct ieee80211_hdr *) pos;
455 pn64 = atomic64_inc_return(&key->conf.tx_pn);
464 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
466 /* hwaccel - with software CCMP header */
467 if (info->control.hw_key)
470 pos += IEEE80211_CCMP_HDR_LEN;
471 ccmp_special_blocks(skb, pn, b_0, aad);
472 return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
473 skb_put(skb, mic_len));
478 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
479 unsigned int mic_len)
483 ieee80211_tx_set_protected(tx);
485 skb_queue_walk(&tx->skbs, skb) {
486 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
495 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
496 unsigned int mic_len)
498 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
500 struct ieee80211_key *key = rx->key;
501 struct sk_buff *skb = rx->skb;
502 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
503 u8 pn[IEEE80211_CCMP_PN_LEN];
507 hdrlen = ieee80211_hdrlen(hdr->frame_control);
509 if (!ieee80211_is_data(hdr->frame_control) &&
510 !ieee80211_is_robust_mgmt_frame(skb))
513 if (status->flag & RX_FLAG_DECRYPTED) {
514 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
515 return RX_DROP_UNUSABLE;
516 if (status->flag & RX_FLAG_MIC_STRIPPED)
519 if (skb_linearize(rx->skb))
520 return RX_DROP_UNUSABLE;
523 /* reload hdr - skb might have been reallocated */
524 hdr = (void *)rx->skb->data;
526 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
527 if (!rx->sta || data_len < 0)
528 return RX_DROP_UNUSABLE;
530 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
533 ccmp_hdr2pn(pn, skb->data + hdrlen);
535 queue = rx->security_idx;
537 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
538 IEEE80211_CCMP_PN_LEN);
540 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
541 key->u.ccmp.replays++;
542 return RX_DROP_UNUSABLE;
545 if (!(status->flag & RX_FLAG_DECRYPTED)) {
546 u8 aad[2 * AES_BLOCK_SIZE];
547 u8 b_0[AES_BLOCK_SIZE];
548 /* hardware didn't decrypt/verify MIC */
549 ccmp_special_blocks(skb, pn, b_0, aad);
551 if (ieee80211_aes_ccm_decrypt(
552 key->u.ccmp.tfm, b_0, aad,
553 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
555 skb->data + skb->len - mic_len))
556 return RX_DROP_UNUSABLE;
559 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
560 if (unlikely(ieee80211_is_frag(hdr)))
561 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
564 /* Remove CCMP header and MIC */
565 if (pskb_trim(skb, skb->len - mic_len))
566 return RX_DROP_UNUSABLE;
567 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
568 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
573 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
577 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
579 memcpy(j_0, hdr->addr2, ETH_ALEN);
580 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
583 j_0[AES_BLOCK_SIZE - 1] = 0x01;
585 /* AAD (extra authenticate-only data) / masked 802.11 header
586 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
588 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
589 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
590 * Retry, PwrMgt, MoreData; set Protected
592 mask_fc = hdr->frame_control;
593 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
594 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
595 if (!ieee80211_is_mgmt(hdr->frame_control))
596 mask_fc &= ~cpu_to_le16(0x0070);
597 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
599 put_unaligned(mask_fc, (__le16 *)&aad[2]);
600 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
602 /* Mask Seq#, leave Frag# */
603 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
606 if (ieee80211_is_data_qos(hdr->frame_control))
607 qos_tid = ieee80211_get_tid(hdr);
611 if (ieee80211_has_a4(hdr->frame_control)) {
612 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
616 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
621 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
626 hdr[3] = 0x20 | (key_id << 6);
633 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
643 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
645 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
646 struct ieee80211_key *key = tx->key;
647 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
648 int hdrlen, len, tail;
653 u8 j_0[AES_BLOCK_SIZE];
655 if (info->control.hw_key &&
656 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
657 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
658 !((info->control.hw_key->flags &
659 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
660 ieee80211_is_mgmt(hdr->frame_control))) {
661 /* hwaccel has no need for preallocated room for GCMP
662 * header or MIC fields
667 hdrlen = ieee80211_hdrlen(hdr->frame_control);
668 len = skb->len - hdrlen;
670 if (info->control.hw_key)
673 tail = IEEE80211_GCMP_MIC_LEN;
675 if (WARN_ON(skb_tailroom(skb) < tail ||
676 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
679 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
680 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
681 skb_set_network_header(skb, skb_network_offset(skb) +
682 IEEE80211_GCMP_HDR_LEN);
684 /* the HW only needs room for the IV, but not the actual IV */
685 if (info->control.hw_key &&
686 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
689 hdr = (struct ieee80211_hdr *)pos;
692 pn64 = atomic64_inc_return(&key->conf.tx_pn);
701 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
703 /* hwaccel - with software GCMP header */
704 if (info->control.hw_key)
707 pos += IEEE80211_GCMP_HDR_LEN;
708 gcmp_special_blocks(skb, pn, j_0, aad);
709 return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
710 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
714 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
718 ieee80211_tx_set_protected(tx);
720 skb_queue_walk(&tx->skbs, skb) {
721 if (gcmp_encrypt_skb(tx, skb) < 0)
729 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
731 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
733 struct ieee80211_key *key = rx->key;
734 struct sk_buff *skb = rx->skb;
735 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
736 u8 pn[IEEE80211_GCMP_PN_LEN];
737 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
739 hdrlen = ieee80211_hdrlen(hdr->frame_control);
741 if (!ieee80211_is_data(hdr->frame_control) &&
742 !ieee80211_is_robust_mgmt_frame(skb))
745 if (status->flag & RX_FLAG_DECRYPTED) {
746 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
747 return RX_DROP_UNUSABLE;
748 if (status->flag & RX_FLAG_MIC_STRIPPED)
751 if (skb_linearize(rx->skb))
752 return RX_DROP_UNUSABLE;
755 /* reload hdr - skb might have been reallocated */
756 hdr = (void *)rx->skb->data;
758 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
759 if (!rx->sta || data_len < 0)
760 return RX_DROP_UNUSABLE;
762 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
765 gcmp_hdr2pn(pn, skb->data + hdrlen);
767 queue = rx->security_idx;
769 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
770 IEEE80211_GCMP_PN_LEN);
772 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
773 key->u.gcmp.replays++;
774 return RX_DROP_UNUSABLE;
777 if (!(status->flag & RX_FLAG_DECRYPTED)) {
778 u8 aad[2 * AES_BLOCK_SIZE];
779 u8 j_0[AES_BLOCK_SIZE];
780 /* hardware didn't decrypt/verify MIC */
781 gcmp_special_blocks(skb, pn, j_0, aad);
783 if (ieee80211_aes_gcm_decrypt(
784 key->u.gcmp.tfm, j_0, aad,
785 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
787 skb->data + skb->len -
788 IEEE80211_GCMP_MIC_LEN))
789 return RX_DROP_UNUSABLE;
792 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
793 if (unlikely(ieee80211_is_frag(hdr)))
794 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
797 /* Remove GCMP header and MIC */
798 if (pskb_trim(skb, skb->len - mic_len))
799 return RX_DROP_UNUSABLE;
800 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
801 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
806 static ieee80211_tx_result
807 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
810 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
811 struct ieee80211_key *key = tx->key;
812 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
814 u8 *pos, iv_len = key->conf.iv_len;
816 if (info->control.hw_key &&
817 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
818 /* hwaccel has no need for preallocated head room */
822 if (unlikely(skb_headroom(skb) < iv_len &&
823 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
826 hdrlen = ieee80211_hdrlen(hdr->frame_control);
828 pos = skb_push(skb, iv_len);
829 memmove(pos, pos + iv_len, hdrlen);
834 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
838 /* pn is little endian */
839 for (i = len - 1; i >= 0; i--) {
842 else if (pn1[i] > pn2[i])
849 static ieee80211_rx_result
850 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
852 struct ieee80211_key *key = rx->key;
853 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
854 const struct ieee80211_cipher_scheme *cs = NULL;
855 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
856 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
862 if (!rx->sta || !rx->sta->cipher_scheme ||
863 !(status->flag & RX_FLAG_DECRYPTED))
864 return RX_DROP_UNUSABLE;
866 if (!ieee80211_is_data(hdr->frame_control))
869 cs = rx->sta->cipher_scheme;
871 data_len = rx->skb->len - hdrlen - cs->hdr_len;
874 return RX_DROP_UNUSABLE;
876 if (ieee80211_is_data_qos(hdr->frame_control))
877 qos_tid = ieee80211_get_tid(hdr);
881 if (skb_linearize(rx->skb))
882 return RX_DROP_UNUSABLE;
884 hdr = (struct ieee80211_hdr *)rx->skb->data;
886 rx_pn = key->u.gen.rx_pn[qos_tid];
887 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
889 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
890 return RX_DROP_UNUSABLE;
892 memcpy(rx_pn, skb_pn, cs->pn_len);
894 /* remove security header and MIC */
895 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
896 return RX_DROP_UNUSABLE;
898 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
899 skb_pull(rx->skb, cs->hdr_len);
904 static void bip_aad(struct sk_buff *skb, u8 *aad)
907 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
909 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
911 /* FC type/subtype */
912 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
913 mask_fc = hdr->frame_control;
914 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
915 IEEE80211_FCTL_MOREDATA);
916 put_unaligned(mask_fc, (__le16 *) &aad[0]);
918 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
922 static inline void bip_ipn_set64(u8 *d, u64 pn)
932 static inline void bip_ipn_swap(u8 *d, const u8 *s)
944 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
947 struct ieee80211_tx_info *info;
948 struct ieee80211_key *key = tx->key;
949 struct ieee80211_mmie *mmie;
953 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
956 skb = skb_peek(&tx->skbs);
958 info = IEEE80211_SKB_CB(skb);
960 if (info->control.hw_key &&
961 !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
964 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
967 mmie = skb_put(skb, sizeof(*mmie));
968 mmie->element_id = WLAN_EID_MMIE;
969 mmie->length = sizeof(*mmie) - 2;
970 mmie->key_id = cpu_to_le16(key->conf.keyidx);
973 pn64 = atomic64_inc_return(&key->conf.tx_pn);
975 bip_ipn_set64(mmie->sequence_number, pn64);
977 if (info->control.hw_key)
983 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
985 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
986 skb->data + 24, skb->len - 24, mmie->mic);
992 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
995 struct ieee80211_tx_info *info;
996 struct ieee80211_key *key = tx->key;
997 struct ieee80211_mmie_16 *mmie;
1001 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1004 skb = skb_peek(&tx->skbs);
1006 info = IEEE80211_SKB_CB(skb);
1008 if (info->control.hw_key)
1011 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1014 mmie = skb_put(skb, sizeof(*mmie));
1015 mmie->element_id = WLAN_EID_MMIE;
1016 mmie->length = sizeof(*mmie) - 2;
1017 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1020 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1022 bip_ipn_set64(mmie->sequence_number, pn64);
1026 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1028 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1029 skb->data + 24, skb->len - 24, mmie->mic);
1035 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1037 struct sk_buff *skb = rx->skb;
1038 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1039 struct ieee80211_key *key = rx->key;
1040 struct ieee80211_mmie *mmie;
1041 u8 aad[20], mic[8], ipn[6];
1042 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1044 if (!ieee80211_is_mgmt(hdr->frame_control))
1047 /* management frames are already linear */
1049 if (skb->len < 24 + sizeof(*mmie))
1050 return RX_DROP_UNUSABLE;
1052 mmie = (struct ieee80211_mmie *)
1053 (skb->data + skb->len - sizeof(*mmie));
1054 if (mmie->element_id != WLAN_EID_MMIE ||
1055 mmie->length != sizeof(*mmie) - 2)
1056 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1058 bip_ipn_swap(ipn, mmie->sequence_number);
1060 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1061 key->u.aes_cmac.replays++;
1062 return RX_DROP_UNUSABLE;
1065 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1066 /* hardware didn't decrypt/verify MIC */
1068 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1069 skb->data + 24, skb->len - 24, mic);
1070 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1071 key->u.aes_cmac.icverrors++;
1072 return RX_DROP_UNUSABLE;
1076 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1079 skb_trim(skb, skb->len - sizeof(*mmie));
1085 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1087 struct sk_buff *skb = rx->skb;
1088 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1089 struct ieee80211_key *key = rx->key;
1090 struct ieee80211_mmie_16 *mmie;
1091 u8 aad[20], mic[16], ipn[6];
1092 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1094 if (!ieee80211_is_mgmt(hdr->frame_control))
1097 /* management frames are already linear */
1099 if (skb->len < 24 + sizeof(*mmie))
1100 return RX_DROP_UNUSABLE;
1102 mmie = (struct ieee80211_mmie_16 *)
1103 (skb->data + skb->len - sizeof(*mmie));
1104 if (mmie->element_id != WLAN_EID_MMIE ||
1105 mmie->length != sizeof(*mmie) - 2)
1106 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1108 bip_ipn_swap(ipn, mmie->sequence_number);
1110 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1111 key->u.aes_cmac.replays++;
1112 return RX_DROP_UNUSABLE;
1115 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1116 /* hardware didn't decrypt/verify MIC */
1118 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1119 skb->data + 24, skb->len - 24, mic);
1120 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1121 key->u.aes_cmac.icverrors++;
1122 return RX_DROP_UNUSABLE;
1126 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1129 skb_trim(skb, skb->len - sizeof(*mmie));
1135 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1137 struct sk_buff *skb;
1138 struct ieee80211_tx_info *info;
1139 struct ieee80211_key *key = tx->key;
1140 struct ieee80211_mmie_16 *mmie;
1141 struct ieee80211_hdr *hdr;
1142 u8 aad[GMAC_AAD_LEN];
1144 u8 nonce[GMAC_NONCE_LEN];
1146 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1149 skb = skb_peek(&tx->skbs);
1151 info = IEEE80211_SKB_CB(skb);
1153 if (info->control.hw_key)
1156 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1159 mmie = skb_put(skb, sizeof(*mmie));
1160 mmie->element_id = WLAN_EID_MMIE;
1161 mmie->length = sizeof(*mmie) - 2;
1162 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1165 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1167 bip_ipn_set64(mmie->sequence_number, pn64);
1171 hdr = (struct ieee80211_hdr *)skb->data;
1172 memcpy(nonce, hdr->addr2, ETH_ALEN);
1173 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1175 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1176 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1177 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1184 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1186 struct sk_buff *skb = rx->skb;
1187 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1188 struct ieee80211_key *key = rx->key;
1189 struct ieee80211_mmie_16 *mmie;
1190 u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN];
1191 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1193 if (!ieee80211_is_mgmt(hdr->frame_control))
1196 /* management frames are already linear */
1198 if (skb->len < 24 + sizeof(*mmie))
1199 return RX_DROP_UNUSABLE;
1201 mmie = (struct ieee80211_mmie_16 *)
1202 (skb->data + skb->len - sizeof(*mmie));
1203 if (mmie->element_id != WLAN_EID_MMIE ||
1204 mmie->length != sizeof(*mmie) - 2)
1205 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1207 bip_ipn_swap(ipn, mmie->sequence_number);
1209 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1210 key->u.aes_gmac.replays++;
1211 return RX_DROP_UNUSABLE;
1214 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1215 /* hardware didn't decrypt/verify MIC */
1218 memcpy(nonce, hdr->addr2, ETH_ALEN);
1219 memcpy(nonce + ETH_ALEN, ipn, 6);
1221 mic = kmalloc(GMAC_MIC_LEN, GFP_ATOMIC);
1223 return RX_DROP_UNUSABLE;
1224 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1225 skb->data + 24, skb->len - 24,
1227 crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1228 key->u.aes_gmac.icverrors++;
1230 return RX_DROP_UNUSABLE;
1235 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1238 skb_trim(skb, skb->len - sizeof(*mmie));
1244 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1246 struct sk_buff *skb;
1247 struct ieee80211_tx_info *info = NULL;
1248 ieee80211_tx_result res;
1250 skb_queue_walk(&tx->skbs, skb) {
1251 info = IEEE80211_SKB_CB(skb);
1253 /* handle hw-only algorithm */
1254 if (!info->control.hw_key)
1257 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1258 res = ieee80211_crypto_cs_encrypt(tx, skb);
1259 if (res != TX_CONTINUE)
1264 ieee80211_tx_set_protected(tx);
1270 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1272 if (rx->sta && rx->sta->cipher_scheme)
1273 return ieee80211_crypto_cs_decrypt(rx);
1275 return RX_DROP_UNUSABLE;