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@ -1,111 +1,10 @@
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--- a/net/mac80211/wpa.c
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+++ b/net/mac80211/wpa.c
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@@ -301,15 +301,22 @@ ieee80211_crypto_tkip_decrypt(struct iee
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}
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-static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
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+static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
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+ int encrypted)
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{
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__le16 mask_fc;
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int a4_included, mgmt;
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u8 qos_tid;
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- u16 len_a;
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+ u8 *b_0, *aad;
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+ u16 data_len, len_a;
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unsigned int hdrlen;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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+ memset(scratch, 0, 6 * AES_BLOCK_SIZE);
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+
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+ b_0 = scratch + 3 * AES_BLOCK_SIZE;
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+ aad = scratch + 4 * AES_BLOCK_SIZE;
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+
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/*
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* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
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* Retry, PwrMgt, MoreData; set Protected
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@@ -331,21 +338,20 @@ static void ccmp_special_blocks(struct s
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else
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qos_tid = 0;
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- /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
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- * mode authentication are not allowed to collide, yet both are derived
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- * from this vector b_0. We only set L := 1 here to indicate that the
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- * data size can be represented in (L+1) bytes. The CCM layer will take
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- * care of storing the data length in the top (L+1) bytes and setting
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- * and clearing the other bits as is required to derive the two IVs.
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- */
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- b_0[0] = 0x1;
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+ data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN;
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+ if (encrypted)
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+ data_len -= IEEE80211_CCMP_MIC_LEN;
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+ /* First block, b_0 */
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+ b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
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/* Nonce: Nonce Flags | A2 | PN
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* Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
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*/
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b_0[1] = qos_tid | (mgmt << 4);
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memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
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memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
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+ /* l(m) */
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+ put_unaligned_be16(data_len, &b_0[14]);
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/* AAD (extra authenticate-only data) / masked 802.11 header
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* FC | A1 | A2 | A3 | SC | [A4] | [QC] */
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@@ -401,8 +407,7 @@ static int ccmp_encrypt_skb(struct ieee8
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u8 *pos;
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u8 pn[6];
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u64 pn64;
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- u8 aad[2 * AES_BLOCK_SIZE];
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- u8 b_0[AES_BLOCK_SIZE];
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+ u8 scratch[6 * AES_BLOCK_SIZE];
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if (info->control.hw_key &&
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!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
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@@ -455,9 +460,9 @@ static int ccmp_encrypt_skb(struct ieee8
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return 0;
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pos += IEEE80211_CCMP_HDR_LEN;
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- ccmp_special_blocks(skb, pn, b_0, aad);
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- ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
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- skb_put(skb, IEEE80211_CCMP_MIC_LEN));
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+ ccmp_special_blocks(skb, pn, scratch, 0);
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+ ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, pos, len,
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+ pos, skb_put(skb, IEEE80211_CCMP_MIC_LEN));
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return 0;
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}
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@@ -520,16 +525,16 @@ ieee80211_crypto_ccmp_decrypt(struct iee
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}
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if (!(status->flag & RX_FLAG_DECRYPTED)) {
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- u8 aad[2 * AES_BLOCK_SIZE];
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- u8 b_0[AES_BLOCK_SIZE];
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+ u8 scratch[6 * AES_BLOCK_SIZE];
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/* hardware didn't decrypt/verify MIC */
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- ccmp_special_blocks(skb, pn, b_0, aad);
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+ ccmp_special_blocks(skb, pn, scratch, 1);
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if (ieee80211_aes_ccm_decrypt(
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- key->u.ccmp.tfm, b_0, aad,
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+ key->u.ccmp.tfm, scratch,
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skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
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data_len,
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- skb->data + skb->len - IEEE80211_CCMP_MIC_LEN))
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+ skb->data + skb->len - IEEE80211_CCMP_MIC_LEN,
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+ skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN))
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return RX_DROP_UNUSABLE;
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}
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--- a/net/mac80211/Kconfig
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+++ b/net/mac80211/Kconfig
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@@ -5,7 +5,6 @@ config MAC80211
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depends on CRYPTO
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depends on CRYPTO_ARC4
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depends on CRYPTO_AES
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- depends on CRYPTO_CCM
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- select BACKPORT_CRYPTO_CCM
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depends on CRC32
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select BACKPORT_AVERAGE
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---help---
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@ -120,35 +19,17 @@
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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@@ -19,75 +17,134 @@
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@@ -19,76 +17,134 @@
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#include "key.h"
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#include "aes_ccm.h"
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-void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
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- u8 *data, size_t data_len, u8 *mic)
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+static void aes_ccm_prepare(struct crypto_cipher *tfm, u8 *scratch, u8 *a)
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{
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- struct scatterlist assoc, pt, ct[2];
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- struct {
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- struct aead_request req;
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- u8 priv[crypto_aead_reqsize(tfm)];
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- } aead_req;
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-
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- memset(&aead_req, 0, sizeof(aead_req));
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-
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- sg_init_one(&pt, data, data_len);
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- sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
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- sg_init_table(ct, 2);
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- sg_set_buf(&ct[0], data, data_len);
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- sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
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-
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- aead_request_set_tfm(&aead_req.req, tfm);
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- aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
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- aead_request_set_crypt(&aead_req.req, &pt, ct, data_len, b_0);
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+{
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+ int i;
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+ u8 *b_0, *aad, *b, *s_0;
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- crypto_aead_encrypt(&aead_req.req);
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+
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+ b_0 = scratch + 3 * AES_BLOCK_SIZE;
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+ aad = scratch + 4 * AES_BLOCK_SIZE;
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+ b = scratch;
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@ -174,22 +55,23 @@
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+ b_0[14] = 0;
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+ b_0[15] = 0;
|
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|
|
+ crypto_cipher_encrypt_one(tfm, s_0, b_0);
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}
|
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|
-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
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|
- u8 *data, size_t data_len, u8 *mic)
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+}
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+
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+
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+void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
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+ u8 *data, size_t data_len,
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|
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+ u8 *cdata, u8 *mic)
|
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{
|
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|
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- struct scatterlist assoc, pt, ct[2];
|
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|
- struct {
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|
|
- struct aead_request req;
|
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|
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- u8 priv[crypto_aead_reqsize(tfm)];
|
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|
|
- } aead_req;
|
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|
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+ int i, j, last_len, num_blocks;
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|
|
+ u8 *pos, *cpos, *b, *s_0, *e, *b_0;
|
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|
|
|
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|
|
- char aead_req_data[sizeof(struct aead_request) +
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|
|
|
- crypto_aead_reqsize(tfm)]
|
|
|
|
|
- __aligned(__alignof__(struct aead_request));
|
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|
|
|
- struct aead_request *aead_req = (void *) aead_req_data;
|
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|
|
|
-
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|
|
|
- memset(&aead_req, 0, sizeof(aead_req));
|
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|
|
|
- memset(aead_req, 0, sizeof(aead_req_data));
|
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|
|
-
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|
|
|
|
- sg_init_one(&pt, data, data_len);
|
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|
|
|
- sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
|
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|
|
|
@ -197,13 +79,9 @@
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|
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- sg_set_buf(&ct[0], data, data_len);
|
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|
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- sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
|
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-
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|
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- aead_request_set_tfm(&aead_req.req, tfm);
|
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|
|
- aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
|
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|
|
|
- aead_request_set_crypt(&aead_req.req, ct, &pt,
|
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|
|
|
- data_len + IEEE80211_CCMP_MIC_LEN, b_0);
|
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|
|
+ int i, j, last_len, num_blocks;
|
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+ u8 *pos, *cpos, *b, *s_0, *e, *b_0;
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+
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|
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- aead_request_set_tfm(aead_req, tfm);
|
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|
- aead_request_set_assoc(aead_req, &assoc, assoc.length);
|
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|
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- aead_request_set_crypt(aead_req, &pt, ct, data_len, b_0);
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|
|
+ b = scratch;
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|
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+ s_0 = scratch + AES_BLOCK_SIZE;
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+ e = scratch + 2 * AES_BLOCK_SIZE;
|
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@ -232,30 +110,38 @@
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+ *cpos++ = *pos++ ^ e[i];
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+ }
|
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|
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- return crypto_aead_decrypt(&aead_req.req);
|
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|
|
|
- crypto_aead_encrypt(aead_req);
|
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|
|
+ for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++)
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|
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+ mic[i] = b[i] ^ s_0[i];
|
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}
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|
|
-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])
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|
|
-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
|
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|
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- u8 *data, size_t data_len, u8 *mic)
|
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+
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|
|
+int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,
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|
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+ u8 *cdata, size_t data_len, u8 *mic, u8 *data)
|
|
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|
|
{
|
|
|
|
|
- struct crypto_aead *tfm;
|
|
|
|
|
- int err;
|
|
|
|
|
- struct scatterlist assoc, pt, ct[2];
|
|
|
|
|
- char aead_req_data[sizeof(struct aead_request) +
|
|
|
|
|
- crypto_aead_reqsize(tfm)]
|
|
|
|
|
- __aligned(__alignof__(struct aead_request));
|
|
|
|
|
- struct aead_request *aead_req = (void *) aead_req_data;
|
|
|
|
|
-
|
|
|
|
|
- memset(aead_req, 0, sizeof(aead_req_data));
|
|
|
|
|
-
|
|
|
|
|
- sg_init_one(&pt, data, data_len);
|
|
|
|
|
- sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
|
|
|
|
|
- sg_init_table(ct, 2);
|
|
|
|
|
- sg_set_buf(&ct[0], data, data_len);
|
|
|
|
|
- sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
|
|
|
|
|
-
|
|
|
|
|
- aead_request_set_tfm(aead_req, tfm);
|
|
|
|
|
- aead_request_set_assoc(aead_req, &assoc, assoc.length);
|
|
|
|
|
- aead_request_set_crypt(aead_req, ct, &pt,
|
|
|
|
|
- data_len + IEEE80211_CCMP_MIC_LEN, b_0);
|
|
|
|
|
+ int i, j, last_len, num_blocks;
|
|
|
|
|
+ u8 *pos, *cpos, *b, *s_0, *a, *b_0;
|
|
|
|
|
|
|
|
|
|
- tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
|
|
|
|
|
- if (IS_ERR(tfm))
|
|
|
|
|
- return tfm;
|
|
|
|
|
-
|
|
|
|
|
- err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
|
|
|
|
|
- if (!err)
|
|
|
|
|
- err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN);
|
|
|
|
|
- if (!err)
|
|
|
|
|
- return tfm;
|
|
|
|
|
+
|
|
|
|
|
+ b = scratch;
|
|
|
|
|
+ s_0 = scratch + AES_BLOCK_SIZE;
|
|
|
|
|
+ a = scratch + 2 * AES_BLOCK_SIZE;
|
|
|
|
|
@ -288,24 +174,37 @@
|
|
|
|
|
+ return -1;
|
|
|
|
|
+ }
|
|
|
|
|
|
|
|
|
|
- crypto_free_aead(tfm);
|
|
|
|
|
- return ERR_PTR(err);
|
|
|
|
|
- return crypto_aead_decrypt(aead_req);
|
|
|
|
|
+ return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
-void ieee80211_aes_key_free(struct crypto_aead *tfm)
|
|
|
|
|
-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])
|
|
|
|
|
+
|
|
|
|
|
+struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[])
|
|
|
|
|
+{
|
|
|
|
|
{
|
|
|
|
|
- struct crypto_aead *tfm;
|
|
|
|
|
- int err;
|
|
|
|
|
+ struct crypto_cipher *tfm;
|
|
|
|
|
+
|
|
|
|
|
|
|
|
|
|
- tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
|
|
|
|
|
- if (IS_ERR(tfm))
|
|
|
|
|
- return tfm;
|
|
|
|
|
-
|
|
|
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- err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
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- if (!err)
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- err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN);
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- if (!err)
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- return tfm;
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+ tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
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+ if (!IS_ERR(tfm))
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+ crypto_cipher_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
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+
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- crypto_free_aead(tfm);
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- return ERR_PTR(err);
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+ return tfm;
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+}
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+
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}
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-void ieee80211_aes_key_free(struct crypto_aead *tfm)
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+
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+void ieee80211_aes_key_free(struct crypto_cipher *tfm)
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{
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@ -345,3 +244,104 @@
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u32 replays; /* dot11RSNAStatsCCMPReplays */
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} ccmp;
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struct {
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--- a/net/mac80211/wpa.c
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+++ b/net/mac80211/wpa.c
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@@ -301,15 +301,22 @@ ieee80211_crypto_tkip_decrypt(struct iee
|
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}
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-static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
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+static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
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+ int encrypted)
|
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|
{
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|
__le16 mask_fc;
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int a4_included, mgmt;
|
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|
|
u8 qos_tid;
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|
|
- u16 len_a;
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|
+ u8 *b_0, *aad;
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|
|
+ u16 data_len, len_a;
|
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|
|
unsigned int hdrlen;
|
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|
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
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|
|
|
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|
|
+ memset(scratch, 0, 6 * AES_BLOCK_SIZE);
|
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|
+
|
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|
|
+ b_0 = scratch + 3 * AES_BLOCK_SIZE;
|
|
|
|
|
+ aad = scratch + 4 * AES_BLOCK_SIZE;
|
|
|
|
|
+
|
|
|
|
|
/*
|
|
|
|
|
* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
|
|
|
|
|
* Retry, PwrMgt, MoreData; set Protected
|
|
|
|
|
@@ -331,21 +338,20 @@ static void ccmp_special_blocks(struct s
|
|
|
|
|
else
|
|
|
|
|
qos_tid = 0;
|
|
|
|
|
|
|
|
|
|
- /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
|
|
|
|
|
- * mode authentication are not allowed to collide, yet both are derived
|
|
|
|
|
- * from this vector b_0. We only set L := 1 here to indicate that the
|
|
|
|
|
- * data size can be represented in (L+1) bytes. The CCM layer will take
|
|
|
|
|
- * care of storing the data length in the top (L+1) bytes and setting
|
|
|
|
|
- * and clearing the other bits as is required to derive the two IVs.
|
|
|
|
|
- */
|
|
|
|
|
- b_0[0] = 0x1;
|
|
|
|
|
+ data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN;
|
|
|
|
|
+ if (encrypted)
|
|
|
|
|
+ data_len -= IEEE80211_CCMP_MIC_LEN;
|
|
|
|
|
|
|
|
|
|
+ /* First block, b_0 */
|
|
|
|
|
+ b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
|
|
|
|
|
/* Nonce: Nonce Flags | A2 | PN
|
|
|
|
|
* Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
|
|
|
|
|
*/
|
|
|
|
|
b_0[1] = qos_tid | (mgmt << 4);
|
|
|
|
|
memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
|
|
|
|
|
memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
|
|
|
|
|
+ /* l(m) */
|
|
|
|
|
+ put_unaligned_be16(data_len, &b_0[14]);
|
|
|
|
|
|
|
|
|
|
/* AAD (extra authenticate-only data) / masked 802.11 header
|
|
|
|
|
* FC | A1 | A2 | A3 | SC | [A4] | [QC] */
|
|
|
|
|
@@ -401,8 +407,7 @@ static int ccmp_encrypt_skb(struct ieee8
|
|
|
|
|
u8 *pos;
|
|
|
|
|
u8 pn[6];
|
|
|
|
|
u64 pn64;
|
|
|
|
|
- u8 aad[2 * AES_BLOCK_SIZE];
|
|
|
|
|
- u8 b_0[AES_BLOCK_SIZE];
|
|
|
|
|
+ u8 scratch[6 * AES_BLOCK_SIZE];
|
|
|
|
|
|
|
|
|
|
if (info->control.hw_key &&
|
|
|
|
|
!(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
|
|
|
|
|
@@ -458,9 +463,9 @@ static int ccmp_encrypt_skb(struct ieee8
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
pos += IEEE80211_CCMP_HDR_LEN;
|
|
|
|
|
- ccmp_special_blocks(skb, pn, b_0, aad);
|
|
|
|
|
- ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
|
|
|
|
|
- skb_put(skb, IEEE80211_CCMP_MIC_LEN));
|
|
|
|
|
+ ccmp_special_blocks(skb, pn, scratch, 0);
|
|
|
|
|
+ ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, pos, len,
|
|
|
|
|
+ pos, skb_put(skb, IEEE80211_CCMP_MIC_LEN));
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
@@ -523,16 +528,16 @@ ieee80211_crypto_ccmp_decrypt(struct iee
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!(status->flag & RX_FLAG_DECRYPTED)) {
|
|
|
|
|
- u8 aad[2 * AES_BLOCK_SIZE];
|
|
|
|
|
- u8 b_0[AES_BLOCK_SIZE];
|
|
|
|
|
+ u8 scratch[6 * AES_BLOCK_SIZE];
|
|
|
|
|
/* hardware didn't decrypt/verify MIC */
|
|
|
|
|
- ccmp_special_blocks(skb, pn, b_0, aad);
|
|
|
|
|
+ ccmp_special_blocks(skb, pn, scratch, 1);
|
|
|
|
|
|
|
|
|
|
if (ieee80211_aes_ccm_decrypt(
|
|
|
|
|
- key->u.ccmp.tfm, b_0, aad,
|
|
|
|
|
+ key->u.ccmp.tfm, scratch,
|
|
|
|
|
skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
|
|
|
|
|
data_len,
|
|
|
|
|
- skb->data + skb->len - IEEE80211_CCMP_MIC_LEN))
|
|
|
|
|
+ skb->data + skb->len - IEEE80211_CCMP_MIC_LEN,
|
|
|
|
|
+ skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN))
|
|
|
|
|
return RX_DROP_UNUSABLE;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
Felix Fietkau
10 years ago