2 * Copyright 2002-2004, Instant802 Networks, Inc.
3 * Copyright 2008, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/netdevice.h>
11 #include <linux/types.h>
12 #include <linux/skbuff.h>
13 #include <linux/compiler.h>
14 #include <linux/ieee80211.h>
15 #include <linux/gfp.h>
16 #include <asm/unaligned.h>
17 #include <net/mac80211.h>
18 #include <crypto/aes.h>
19 #include <crypto/algapi.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 (crypto_memneq(mic, data + data_len, MICHAEL_MIC_LEN))
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;
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);
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 spin_lock(&key->u.tkip.txlock);
227 key->u.tkip.tx.iv16++;
228 if (key->u.tkip.tx.iv16 == 0)
229 key->u.tkip.tx.iv32++;
230 pos = ieee80211_tkip_add_iv(pos, key);
231 spin_unlock(&key->u.tkip.txlock);
233 /* hwaccel - with software IV */
234 if (info->control.hw_key)
237 /* Add room for ICV */
238 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
240 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
246 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
250 ieee80211_tx_set_protected(tx);
252 skb_queue_walk(&tx->skbs, skb) {
253 if (tkip_encrypt_skb(tx, skb) < 0)
262 ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
264 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
265 int hdrlen, res, hwaccel = 0;
266 struct ieee80211_key *key = rx->key;
267 struct sk_buff *skb = rx->skb;
268 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
270 hdrlen = ieee80211_hdrlen(hdr->frame_control);
272 if (!ieee80211_is_data(hdr->frame_control))
275 if (!rx->sta || skb->len - hdrlen < 12)
276 return RX_DROP_UNUSABLE;
278 /* it may be possible to optimize this a bit more */
279 if (skb_linearize(rx->skb))
280 return RX_DROP_UNUSABLE;
281 hdr = (void *)skb->data;
284 * Let TKIP code verify IV, but skip decryption.
285 * In the case where hardware checks the IV as well,
286 * we don't even get here, see ieee80211_rx_h_decrypt()
288 if (status->flag & RX_FLAG_DECRYPTED)
291 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
292 key, skb->data + hdrlen,
293 skb->len - hdrlen, rx->sta->sta.addr,
294 hdr->addr1, hwaccel, rx->security_idx,
297 if (res != TKIP_DECRYPT_OK)
298 return RX_DROP_UNUSABLE;
301 if (!(status->flag & RX_FLAG_ICV_STRIPPED))
302 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
305 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
306 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
312 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
315 int a4_included, mgmt;
319 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
322 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
323 * Retry, PwrMgt, MoreData; set Protected
325 mgmt = ieee80211_is_mgmt(hdr->frame_control);
326 mask_fc = hdr->frame_control;
327 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
328 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
330 mask_fc &= ~cpu_to_le16(0x0070);
331 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
333 hdrlen = ieee80211_hdrlen(hdr->frame_control);
335 a4_included = ieee80211_has_a4(hdr->frame_control);
337 if (ieee80211_is_data_qos(hdr->frame_control))
338 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
342 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
343 * mode authentication are not allowed to collide, yet both are derived
344 * from this vector b_0. We only set L := 1 here to indicate that the
345 * data size can be represented in (L+1) bytes. The CCM layer will take
346 * care of storing the data length in the top (L+1) bytes and setting
347 * and clearing the other bits as is required to derive the two IVs.
351 /* Nonce: Nonce Flags | A2 | PN
352 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
354 b_0[1] = qos_tid | (mgmt << 4);
355 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
356 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
358 /* AAD (extra authenticate-only data) / masked 802.11 header
359 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
360 put_unaligned_be16(len_a, &aad[0]);
361 put_unaligned(mask_fc, (__le16 *)&aad[2]);
362 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
364 /* Mask Seq#, leave Frag# */
365 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
369 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
373 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
379 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
384 hdr[3] = 0x20 | (key_id << 6);
392 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
403 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
404 unsigned int mic_len)
406 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
407 struct ieee80211_key *key = tx->key;
408 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
409 int hdrlen, len, tail;
413 u8 aad[2 * AES_BLOCK_SIZE];
414 u8 b_0[AES_BLOCK_SIZE];
416 if (info->control.hw_key &&
417 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
418 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
419 !((info->control.hw_key->flags &
420 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
421 ieee80211_is_mgmt(hdr->frame_control))) {
423 * hwaccel has no need for preallocated room for CCMP
424 * header or MIC fields
429 hdrlen = ieee80211_hdrlen(hdr->frame_control);
430 len = skb->len - hdrlen;
432 if (info->control.hw_key)
437 if (WARN_ON(skb_tailroom(skb) < tail ||
438 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
441 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
442 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
444 /* the HW only needs room for the IV, but not the actual IV */
445 if (info->control.hw_key &&
446 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
449 hdr = (struct ieee80211_hdr *) pos;
452 pn64 = atomic64_inc_return(&key->conf.tx_pn);
461 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
463 /* hwaccel - with software CCMP header */
464 if (info->control.hw_key)
467 pos += IEEE80211_CCMP_HDR_LEN;
468 ccmp_special_blocks(skb, pn, b_0, aad);
469 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
470 skb_put(skb, mic_len), mic_len);
477 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
478 unsigned int mic_len)
482 ieee80211_tx_set_protected(tx);
484 skb_queue_walk(&tx->skbs, skb) {
485 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
494 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
495 unsigned int mic_len)
497 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
499 struct ieee80211_key *key = rx->key;
500 struct sk_buff *skb = rx->skb;
501 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
502 u8 pn[IEEE80211_CCMP_PN_LEN];
506 hdrlen = ieee80211_hdrlen(hdr->frame_control);
508 if (!ieee80211_is_data(hdr->frame_control) &&
509 !ieee80211_is_robust_mgmt_frame(skb))
512 if (status->flag & RX_FLAG_DECRYPTED) {
513 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
514 return RX_DROP_UNUSABLE;
515 if (status->flag & RX_FLAG_MIC_STRIPPED)
518 if (skb_linearize(rx->skb))
519 return RX_DROP_UNUSABLE;
522 /* reload hdr - skb might have been reallocated */
523 hdr = (void *)rx->skb->data;
525 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
526 if (!rx->sta || data_len < 0)
527 return RX_DROP_UNUSABLE;
529 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
532 ccmp_hdr2pn(pn, skb->data + hdrlen);
534 queue = rx->security_idx;
536 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
537 IEEE80211_CCMP_PN_LEN);
539 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
540 key->u.ccmp.replays++;
541 return RX_DROP_UNUSABLE;
544 if (!(status->flag & RX_FLAG_DECRYPTED)) {
545 u8 aad[2 * AES_BLOCK_SIZE];
546 u8 b_0[AES_BLOCK_SIZE];
547 /* hardware didn't decrypt/verify MIC */
548 ccmp_special_blocks(skb, pn, b_0, aad);
550 if (ieee80211_aes_ccm_decrypt(
551 key->u.ccmp.tfm, b_0, aad,
552 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
554 skb->data + skb->len - mic_len, mic_len))
555 return RX_DROP_UNUSABLE;
558 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
559 if (unlikely(ieee80211_is_frag(hdr)))
560 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
563 /* Remove CCMP header and MIC */
564 if (pskb_trim(skb, skb->len - mic_len))
565 return RX_DROP_UNUSABLE;
566 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
567 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
572 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
576 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
578 memcpy(j_0, hdr->addr2, ETH_ALEN);
579 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
582 j_0[AES_BLOCK_SIZE - 1] = 0x01;
584 /* AAD (extra authenticate-only data) / masked 802.11 header
585 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
587 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
588 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
589 * Retry, PwrMgt, MoreData; set Protected
591 mask_fc = hdr->frame_control;
592 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
593 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
594 if (!ieee80211_is_mgmt(hdr->frame_control))
595 mask_fc &= ~cpu_to_le16(0x0070);
596 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
598 put_unaligned(mask_fc, (__le16 *)&aad[2]);
599 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
601 /* Mask Seq#, leave Frag# */
602 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
605 if (ieee80211_is_data_qos(hdr->frame_control))
606 qos_tid = *ieee80211_get_qos_ctl(hdr) &
607 IEEE80211_QOS_CTL_TID_MASK;
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;
652 u8 aad[2 * AES_BLOCK_SIZE];
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 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
710 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
716 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
720 ieee80211_tx_set_protected(tx);
722 skb_queue_walk(&tx->skbs, skb) {
723 if (gcmp_encrypt_skb(tx, skb) < 0)
731 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
733 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
735 struct ieee80211_key *key = rx->key;
736 struct sk_buff *skb = rx->skb;
737 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
738 u8 pn[IEEE80211_GCMP_PN_LEN];
739 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
741 hdrlen = ieee80211_hdrlen(hdr->frame_control);
743 if (!ieee80211_is_data(hdr->frame_control) &&
744 !ieee80211_is_robust_mgmt_frame(skb))
747 if (status->flag & RX_FLAG_DECRYPTED) {
748 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
749 return RX_DROP_UNUSABLE;
750 if (status->flag & RX_FLAG_MIC_STRIPPED)
753 if (skb_linearize(rx->skb))
754 return RX_DROP_UNUSABLE;
757 /* reload hdr - skb might have been reallocated */
758 hdr = (void *)rx->skb->data;
760 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
761 if (!rx->sta || data_len < 0)
762 return RX_DROP_UNUSABLE;
764 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
767 gcmp_hdr2pn(pn, skb->data + hdrlen);
769 queue = rx->security_idx;
771 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
772 IEEE80211_GCMP_PN_LEN);
774 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
775 key->u.gcmp.replays++;
776 return RX_DROP_UNUSABLE;
779 if (!(status->flag & RX_FLAG_DECRYPTED)) {
780 u8 aad[2 * AES_BLOCK_SIZE];
781 u8 j_0[AES_BLOCK_SIZE];
782 /* hardware didn't decrypt/verify MIC */
783 gcmp_special_blocks(skb, pn, j_0, aad);
785 if (ieee80211_aes_gcm_decrypt(
786 key->u.gcmp.tfm, j_0, aad,
787 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
789 skb->data + skb->len -
790 IEEE80211_GCMP_MIC_LEN))
791 return RX_DROP_UNUSABLE;
794 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
795 if (unlikely(ieee80211_is_frag(hdr)))
796 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
799 /* Remove GCMP header and MIC */
800 if (pskb_trim(skb, skb->len - mic_len))
801 return RX_DROP_UNUSABLE;
802 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
803 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
808 static ieee80211_tx_result
809 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
812 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
813 struct ieee80211_key *key = tx->key;
814 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
816 u8 *pos, iv_len = key->conf.iv_len;
818 if (info->control.hw_key &&
819 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
820 /* hwaccel has no need for preallocated head room */
824 if (unlikely(skb_headroom(skb) < iv_len &&
825 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
828 hdrlen = ieee80211_hdrlen(hdr->frame_control);
830 pos = skb_push(skb, iv_len);
831 memmove(pos, pos + iv_len, hdrlen);
836 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
840 /* pn is little endian */
841 for (i = len - 1; i >= 0; i--) {
844 else if (pn1[i] > pn2[i])
851 static ieee80211_rx_result
852 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
854 struct ieee80211_key *key = rx->key;
855 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
856 const struct ieee80211_cipher_scheme *cs = NULL;
857 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
858 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
864 if (!rx->sta || !rx->sta->cipher_scheme ||
865 !(status->flag & RX_FLAG_DECRYPTED))
866 return RX_DROP_UNUSABLE;
868 if (!ieee80211_is_data(hdr->frame_control))
871 cs = rx->sta->cipher_scheme;
873 data_len = rx->skb->len - hdrlen - cs->hdr_len;
876 return RX_DROP_UNUSABLE;
878 if (ieee80211_is_data_qos(hdr->frame_control))
879 qos_tid = *ieee80211_get_qos_ctl(hdr) &
880 IEEE80211_QOS_CTL_TID_MASK;
884 if (skb_linearize(rx->skb))
885 return RX_DROP_UNUSABLE;
887 hdr = (struct ieee80211_hdr *)rx->skb->data;
889 rx_pn = key->u.gen.rx_pn[qos_tid];
890 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
892 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
893 return RX_DROP_UNUSABLE;
895 memcpy(rx_pn, skb_pn, cs->pn_len);
897 /* remove security header and MIC */
898 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
899 return RX_DROP_UNUSABLE;
901 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
902 skb_pull(rx->skb, cs->hdr_len);
907 static void bip_aad(struct sk_buff *skb, u8 *aad)
910 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
912 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
914 /* FC type/subtype */
915 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
916 mask_fc = hdr->frame_control;
917 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
918 IEEE80211_FCTL_MOREDATA);
919 put_unaligned(mask_fc, (__le16 *) &aad[0]);
921 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
925 static inline void bip_ipn_set64(u8 *d, u64 pn)
935 static inline void bip_ipn_swap(u8 *d, const u8 *s)
947 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
950 struct ieee80211_tx_info *info;
951 struct ieee80211_key *key = tx->key;
952 struct ieee80211_mmie *mmie;
956 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
959 skb = skb_peek(&tx->skbs);
961 info = IEEE80211_SKB_CB(skb);
963 if (info->control.hw_key)
966 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
969 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
970 mmie->element_id = WLAN_EID_MMIE;
971 mmie->length = sizeof(*mmie) - 2;
972 mmie->key_id = cpu_to_le16(key->conf.keyidx);
975 pn64 = atomic64_inc_return(&key->conf.tx_pn);
977 bip_ipn_set64(mmie->sequence_number, pn64);
982 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
984 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
985 skb->data + 24, skb->len - 24, mmie->mic);
991 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
994 struct ieee80211_tx_info *info;
995 struct ieee80211_key *key = tx->key;
996 struct ieee80211_mmie_16 *mmie;
1000 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1003 skb = skb_peek(&tx->skbs);
1005 info = IEEE80211_SKB_CB(skb);
1007 if (info->control.hw_key)
1010 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1013 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1014 mmie->element_id = WLAN_EID_MMIE;
1015 mmie->length = sizeof(*mmie) - 2;
1016 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1019 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1021 bip_ipn_set64(mmie->sequence_number, pn64);
1025 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1027 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1028 skb->data + 24, skb->len - 24, mmie->mic);
1034 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1036 struct sk_buff *skb = rx->skb;
1037 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1038 struct ieee80211_key *key = rx->key;
1039 struct ieee80211_mmie *mmie;
1040 u8 aad[20], mic[8], ipn[6];
1041 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1043 if (!ieee80211_is_mgmt(hdr->frame_control))
1046 /* management frames are already linear */
1048 if (skb->len < 24 + sizeof(*mmie))
1049 return RX_DROP_UNUSABLE;
1051 mmie = (struct ieee80211_mmie *)
1052 (skb->data + skb->len - sizeof(*mmie));
1053 if (mmie->element_id != WLAN_EID_MMIE ||
1054 mmie->length != sizeof(*mmie) - 2)
1055 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1057 bip_ipn_swap(ipn, mmie->sequence_number);
1059 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1060 key->u.aes_cmac.replays++;
1061 return RX_DROP_UNUSABLE;
1064 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1065 /* hardware didn't decrypt/verify MIC */
1067 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1068 skb->data + 24, skb->len - 24, mic);
1069 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1070 key->u.aes_cmac.icverrors++;
1071 return RX_DROP_UNUSABLE;
1075 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1078 skb_trim(skb, skb->len - sizeof(*mmie));
1084 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1086 struct sk_buff *skb = rx->skb;
1087 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1088 struct ieee80211_key *key = rx->key;
1089 struct ieee80211_mmie_16 *mmie;
1090 u8 aad[20], mic[16], ipn[6];
1091 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1093 if (!ieee80211_is_mgmt(hdr->frame_control))
1096 /* management frames are already linear */
1098 if (skb->len < 24 + sizeof(*mmie))
1099 return RX_DROP_UNUSABLE;
1101 mmie = (struct ieee80211_mmie_16 *)
1102 (skb->data + skb->len - sizeof(*mmie));
1103 if (mmie->element_id != WLAN_EID_MMIE ||
1104 mmie->length != sizeof(*mmie) - 2)
1105 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1107 bip_ipn_swap(ipn, mmie->sequence_number);
1109 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1110 key->u.aes_cmac.replays++;
1111 return RX_DROP_UNUSABLE;
1114 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1115 /* hardware didn't decrypt/verify MIC */
1117 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1118 skb->data + 24, skb->len - 24, mic);
1119 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1120 key->u.aes_cmac.icverrors++;
1121 return RX_DROP_UNUSABLE;
1125 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1128 skb_trim(skb, skb->len - sizeof(*mmie));
1134 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1136 struct sk_buff *skb;
1137 struct ieee80211_tx_info *info;
1138 struct ieee80211_key *key = tx->key;
1139 struct ieee80211_mmie_16 *mmie;
1140 struct ieee80211_hdr *hdr;
1145 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1148 skb = skb_peek(&tx->skbs);
1150 info = IEEE80211_SKB_CB(skb);
1152 if (info->control.hw_key)
1155 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1158 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1159 mmie->element_id = WLAN_EID_MMIE;
1160 mmie->length = sizeof(*mmie) - 2;
1161 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1164 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1166 bip_ipn_set64(mmie->sequence_number, pn64);
1170 hdr = (struct ieee80211_hdr *)skb->data;
1171 memcpy(nonce, hdr->addr2, ETH_ALEN);
1172 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1174 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1175 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1176 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1183 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1185 struct sk_buff *skb = rx->skb;
1186 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1187 struct ieee80211_key *key = rx->key;
1188 struct ieee80211_mmie_16 *mmie;
1189 u8 aad[20], mic[16], ipn[6], nonce[12];
1190 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1192 if (!ieee80211_is_mgmt(hdr->frame_control))
1195 /* management frames are already linear */
1197 if (skb->len < 24 + sizeof(*mmie))
1198 return RX_DROP_UNUSABLE;
1200 mmie = (struct ieee80211_mmie_16 *)
1201 (skb->data + skb->len - sizeof(*mmie));
1202 if (mmie->element_id != WLAN_EID_MMIE ||
1203 mmie->length != sizeof(*mmie) - 2)
1204 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1206 bip_ipn_swap(ipn, mmie->sequence_number);
1208 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1209 key->u.aes_gmac.replays++;
1210 return RX_DROP_UNUSABLE;
1213 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1214 /* hardware didn't decrypt/verify MIC */
1217 memcpy(nonce, hdr->addr2, ETH_ALEN);
1218 memcpy(nonce + ETH_ALEN, ipn, 6);
1220 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1221 skb->data + 24, skb->len - 24,
1223 crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1224 key->u.aes_gmac.icverrors++;
1225 return RX_DROP_UNUSABLE;
1229 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1232 skb_trim(skb, skb->len - sizeof(*mmie));
1238 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1240 struct sk_buff *skb;
1241 struct ieee80211_tx_info *info = NULL;
1242 ieee80211_tx_result res;
1244 skb_queue_walk(&tx->skbs, skb) {
1245 info = IEEE80211_SKB_CB(skb);
1247 /* handle hw-only algorithm */
1248 if (!info->control.hw_key)
1251 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1252 res = ieee80211_crypto_cs_encrypt(tx, skb);
1253 if (res != TX_CONTINUE)
1258 ieee80211_tx_set_protected(tx);
1264 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1266 if (rx->sta && rx->sta->cipher_scheme)
1267 return ieee80211_crypto_cs_decrypt(rx);
1269 return RX_DROP_UNUSABLE;