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 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
523 if (!rx->sta || data_len < 0)
524 return RX_DROP_UNUSABLE;
526 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
529 ccmp_hdr2pn(pn, skb->data + hdrlen);
531 queue = rx->security_idx;
533 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
534 IEEE80211_CCMP_PN_LEN);
536 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
537 key->u.ccmp.replays++;
538 return RX_DROP_UNUSABLE;
541 if (!(status->flag & RX_FLAG_DECRYPTED)) {
542 u8 aad[2 * AES_BLOCK_SIZE];
543 u8 b_0[AES_BLOCK_SIZE];
544 /* hardware didn't decrypt/verify MIC */
545 ccmp_special_blocks(skb, pn, b_0, aad);
547 if (ieee80211_aes_ccm_decrypt(
548 key->u.ccmp.tfm, b_0, aad,
549 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
551 skb->data + skb->len - mic_len, mic_len))
552 return RX_DROP_UNUSABLE;
555 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
556 if (unlikely(ieee80211_is_frag(hdr)))
557 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
560 /* Remove CCMP header and MIC */
561 if (pskb_trim(skb, skb->len - mic_len))
562 return RX_DROP_UNUSABLE;
563 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
564 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
569 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
573 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
575 memcpy(j_0, hdr->addr2, ETH_ALEN);
576 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
579 j_0[AES_BLOCK_SIZE - 1] = 0x01;
581 /* AAD (extra authenticate-only data) / masked 802.11 header
582 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
584 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
585 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
586 * Retry, PwrMgt, MoreData; set Protected
588 mask_fc = hdr->frame_control;
589 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
590 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
591 if (!ieee80211_is_mgmt(hdr->frame_control))
592 mask_fc &= ~cpu_to_le16(0x0070);
593 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
595 put_unaligned(mask_fc, (__le16 *)&aad[2]);
596 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
598 /* Mask Seq#, leave Frag# */
599 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
602 if (ieee80211_is_data_qos(hdr->frame_control))
603 qos_tid = *ieee80211_get_qos_ctl(hdr) &
604 IEEE80211_QOS_CTL_TID_MASK;
608 if (ieee80211_has_a4(hdr->frame_control)) {
609 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
613 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
618 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
623 hdr[3] = 0x20 | (key_id << 6);
630 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
640 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
642 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
643 struct ieee80211_key *key = tx->key;
644 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
645 int hdrlen, len, tail;
649 u8 aad[2 * AES_BLOCK_SIZE];
650 u8 j_0[AES_BLOCK_SIZE];
652 if (info->control.hw_key &&
653 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
654 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
655 !((info->control.hw_key->flags &
656 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
657 ieee80211_is_mgmt(hdr->frame_control))) {
658 /* hwaccel has no need for preallocated room for GCMP
659 * header or MIC fields
664 hdrlen = ieee80211_hdrlen(hdr->frame_control);
665 len = skb->len - hdrlen;
667 if (info->control.hw_key)
670 tail = IEEE80211_GCMP_MIC_LEN;
672 if (WARN_ON(skb_tailroom(skb) < tail ||
673 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
676 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
677 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
678 skb_set_network_header(skb, skb_network_offset(skb) +
679 IEEE80211_GCMP_HDR_LEN);
681 /* the HW only needs room for the IV, but not the actual IV */
682 if (info->control.hw_key &&
683 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
686 hdr = (struct ieee80211_hdr *)pos;
689 pn64 = atomic64_inc_return(&key->conf.tx_pn);
698 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
700 /* hwaccel - with software GCMP header */
701 if (info->control.hw_key)
704 pos += IEEE80211_GCMP_HDR_LEN;
705 gcmp_special_blocks(skb, pn, j_0, aad);
706 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
707 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
713 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
717 ieee80211_tx_set_protected(tx);
719 skb_queue_walk(&tx->skbs, skb) {
720 if (gcmp_encrypt_skb(tx, skb) < 0)
728 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
730 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
732 struct ieee80211_key *key = rx->key;
733 struct sk_buff *skb = rx->skb;
734 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
735 u8 pn[IEEE80211_GCMP_PN_LEN];
736 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
738 hdrlen = ieee80211_hdrlen(hdr->frame_control);
740 if (!ieee80211_is_data(hdr->frame_control) &&
741 !ieee80211_is_robust_mgmt_frame(skb))
744 if (status->flag & RX_FLAG_DECRYPTED) {
745 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
746 return RX_DROP_UNUSABLE;
747 if (status->flag & RX_FLAG_MIC_STRIPPED)
750 if (skb_linearize(rx->skb))
751 return RX_DROP_UNUSABLE;
754 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
755 if (!rx->sta || data_len < 0)
756 return RX_DROP_UNUSABLE;
758 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
761 gcmp_hdr2pn(pn, skb->data + hdrlen);
763 queue = rx->security_idx;
765 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
766 IEEE80211_GCMP_PN_LEN);
768 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
769 key->u.gcmp.replays++;
770 return RX_DROP_UNUSABLE;
773 if (!(status->flag & RX_FLAG_DECRYPTED)) {
774 u8 aad[2 * AES_BLOCK_SIZE];
775 u8 j_0[AES_BLOCK_SIZE];
776 /* hardware didn't decrypt/verify MIC */
777 gcmp_special_blocks(skb, pn, j_0, aad);
779 if (ieee80211_aes_gcm_decrypt(
780 key->u.gcmp.tfm, j_0, aad,
781 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
783 skb->data + skb->len -
784 IEEE80211_GCMP_MIC_LEN))
785 return RX_DROP_UNUSABLE;
788 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
789 if (unlikely(ieee80211_is_frag(hdr)))
790 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
793 /* Remove GCMP header and MIC */
794 if (pskb_trim(skb, skb->len - mic_len))
795 return RX_DROP_UNUSABLE;
796 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
797 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
802 static ieee80211_tx_result
803 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
807 struct ieee80211_key *key = tx->key;
808 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
810 u8 *pos, iv_len = key->conf.iv_len;
812 if (info->control.hw_key &&
813 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
814 /* hwaccel has no need for preallocated head room */
818 if (unlikely(skb_headroom(skb) < iv_len &&
819 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
822 hdrlen = ieee80211_hdrlen(hdr->frame_control);
824 pos = skb_push(skb, iv_len);
825 memmove(pos, pos + iv_len, hdrlen);
830 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
834 /* pn is little endian */
835 for (i = len - 1; i >= 0; i--) {
838 else if (pn1[i] > pn2[i])
845 static ieee80211_rx_result
846 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
848 struct ieee80211_key *key = rx->key;
849 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
850 const struct ieee80211_cipher_scheme *cs = NULL;
851 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
852 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
858 if (!rx->sta || !rx->sta->cipher_scheme ||
859 !(status->flag & RX_FLAG_DECRYPTED))
860 return RX_DROP_UNUSABLE;
862 if (!ieee80211_is_data(hdr->frame_control))
865 cs = rx->sta->cipher_scheme;
867 data_len = rx->skb->len - hdrlen - cs->hdr_len;
870 return RX_DROP_UNUSABLE;
872 if (ieee80211_is_data_qos(hdr->frame_control))
873 qos_tid = *ieee80211_get_qos_ctl(hdr) &
874 IEEE80211_QOS_CTL_TID_MASK;
878 if (skb_linearize(rx->skb))
879 return RX_DROP_UNUSABLE;
881 hdr = (struct ieee80211_hdr *)rx->skb->data;
883 rx_pn = key->u.gen.rx_pn[qos_tid];
884 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
886 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
887 return RX_DROP_UNUSABLE;
889 memcpy(rx_pn, skb_pn, cs->pn_len);
891 /* remove security header and MIC */
892 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
893 return RX_DROP_UNUSABLE;
895 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
896 skb_pull(rx->skb, cs->hdr_len);
901 static void bip_aad(struct sk_buff *skb, u8 *aad)
904 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
906 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
908 /* FC type/subtype */
909 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
910 mask_fc = hdr->frame_control;
911 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
912 IEEE80211_FCTL_MOREDATA);
913 put_unaligned(mask_fc, (__le16 *) &aad[0]);
915 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
919 static inline void bip_ipn_set64(u8 *d, u64 pn)
929 static inline void bip_ipn_swap(u8 *d, const u8 *s)
941 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
944 struct ieee80211_tx_info *info;
945 struct ieee80211_key *key = tx->key;
946 struct ieee80211_mmie *mmie;
950 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
953 skb = skb_peek(&tx->skbs);
955 info = IEEE80211_SKB_CB(skb);
957 if (info->control.hw_key)
960 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
963 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
964 mmie->element_id = WLAN_EID_MMIE;
965 mmie->length = sizeof(*mmie) - 2;
966 mmie->key_id = cpu_to_le16(key->conf.keyidx);
969 pn64 = atomic64_inc_return(&key->conf.tx_pn);
971 bip_ipn_set64(mmie->sequence_number, pn64);
976 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
978 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
979 skb->data + 24, skb->len - 24, mmie->mic);
985 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
988 struct ieee80211_tx_info *info;
989 struct ieee80211_key *key = tx->key;
990 struct ieee80211_mmie_16 *mmie;
994 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
997 skb = skb_peek(&tx->skbs);
999 info = IEEE80211_SKB_CB(skb);
1001 if (info->control.hw_key)
1004 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1007 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1008 mmie->element_id = WLAN_EID_MMIE;
1009 mmie->length = sizeof(*mmie) - 2;
1010 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1013 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1015 bip_ipn_set64(mmie->sequence_number, pn64);
1019 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1021 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1022 skb->data + 24, skb->len - 24, mmie->mic);
1028 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1030 struct sk_buff *skb = rx->skb;
1031 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1032 struct ieee80211_key *key = rx->key;
1033 struct ieee80211_mmie *mmie;
1034 u8 aad[20], mic[8], ipn[6];
1035 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1037 if (!ieee80211_is_mgmt(hdr->frame_control))
1040 /* management frames are already linear */
1042 if (skb->len < 24 + sizeof(*mmie))
1043 return RX_DROP_UNUSABLE;
1045 mmie = (struct ieee80211_mmie *)
1046 (skb->data + skb->len - sizeof(*mmie));
1047 if (mmie->element_id != WLAN_EID_MMIE ||
1048 mmie->length != sizeof(*mmie) - 2)
1049 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1051 bip_ipn_swap(ipn, mmie->sequence_number);
1053 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1054 key->u.aes_cmac.replays++;
1055 return RX_DROP_UNUSABLE;
1058 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1059 /* hardware didn't decrypt/verify MIC */
1061 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
1062 skb->data + 24, skb->len - 24, mic);
1063 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1064 key->u.aes_cmac.icverrors++;
1065 return RX_DROP_UNUSABLE;
1069 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1072 skb_trim(skb, skb->len - sizeof(*mmie));
1078 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1080 struct sk_buff *skb = rx->skb;
1081 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1082 struct ieee80211_key *key = rx->key;
1083 struct ieee80211_mmie_16 *mmie;
1084 u8 aad[20], mic[16], ipn[6];
1085 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1087 if (!ieee80211_is_mgmt(hdr->frame_control))
1090 /* management frames are already linear */
1092 if (skb->len < 24 + sizeof(*mmie))
1093 return RX_DROP_UNUSABLE;
1095 mmie = (struct ieee80211_mmie_16 *)
1096 (skb->data + skb->len - sizeof(*mmie));
1097 if (mmie->element_id != WLAN_EID_MMIE ||
1098 mmie->length != sizeof(*mmie) - 2)
1099 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1101 bip_ipn_swap(ipn, mmie->sequence_number);
1103 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1104 key->u.aes_cmac.replays++;
1105 return RX_DROP_UNUSABLE;
1108 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1109 /* hardware didn't decrypt/verify MIC */
1111 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1112 skb->data + 24, skb->len - 24, mic);
1113 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1114 key->u.aes_cmac.icverrors++;
1115 return RX_DROP_UNUSABLE;
1119 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1122 skb_trim(skb, skb->len - sizeof(*mmie));
1128 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1130 struct sk_buff *skb;
1131 struct ieee80211_tx_info *info;
1132 struct ieee80211_key *key = tx->key;
1133 struct ieee80211_mmie_16 *mmie;
1134 struct ieee80211_hdr *hdr;
1139 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1142 skb = skb_peek(&tx->skbs);
1144 info = IEEE80211_SKB_CB(skb);
1146 if (info->control.hw_key)
1149 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1152 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1153 mmie->element_id = WLAN_EID_MMIE;
1154 mmie->length = sizeof(*mmie) - 2;
1155 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1158 pn64 = atomic64_inc_return(&key->conf.tx_pn);
1160 bip_ipn_set64(mmie->sequence_number, pn64);
1164 hdr = (struct ieee80211_hdr *)skb->data;
1165 memcpy(nonce, hdr->addr2, ETH_ALEN);
1166 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1168 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1169 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1170 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1177 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1179 struct sk_buff *skb = rx->skb;
1180 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1181 struct ieee80211_key *key = rx->key;
1182 struct ieee80211_mmie_16 *mmie;
1183 u8 aad[20], mic[16], ipn[6], nonce[12];
1184 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1186 if (!ieee80211_is_mgmt(hdr->frame_control))
1189 /* management frames are already linear */
1191 if (skb->len < 24 + sizeof(*mmie))
1192 return RX_DROP_UNUSABLE;
1194 mmie = (struct ieee80211_mmie_16 *)
1195 (skb->data + skb->len - sizeof(*mmie));
1196 if (mmie->element_id != WLAN_EID_MMIE ||
1197 mmie->length != sizeof(*mmie) - 2)
1198 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1200 bip_ipn_swap(ipn, mmie->sequence_number);
1202 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1203 key->u.aes_gmac.replays++;
1204 return RX_DROP_UNUSABLE;
1207 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1208 /* hardware didn't decrypt/verify MIC */
1211 memcpy(nonce, hdr->addr2, ETH_ALEN);
1212 memcpy(nonce + ETH_ALEN, ipn, 6);
1214 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1215 skb->data + 24, skb->len - 24,
1217 crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1218 key->u.aes_gmac.icverrors++;
1219 return RX_DROP_UNUSABLE;
1223 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1226 skb_trim(skb, skb->len - sizeof(*mmie));
1232 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1234 struct sk_buff *skb;
1235 struct ieee80211_tx_info *info = NULL;
1236 ieee80211_tx_result res;
1238 skb_queue_walk(&tx->skbs, skb) {
1239 info = IEEE80211_SKB_CB(skb);
1241 /* handle hw-only algorithm */
1242 if (!info->control.hw_key)
1245 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
1246 res = ieee80211_crypto_cs_encrypt(tx, skb);
1247 if (res != TX_CONTINUE)
1252 ieee80211_tx_set_protected(tx);
1258 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1260 if (rx->sta && rx->sta->cipher_scheme)
1261 return ieee80211_crypto_cs_decrypt(rx);
1263 return RX_DROP_UNUSABLE;