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Openwrt/package/kernel/mac80211/patches/100-revert_aes_ccm_port.patch
Felix Fietkau 8513629e3e mac80211: update to wireless-testing 2014-05-19 
Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 40800
2014-05-20 09:35:17 +00:00

348 lines
10 KiB
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--- a/net/mac80211/Kconfig
+++ b/net/mac80211/Kconfig
@@ -5,7 +5,6 @@ config MAC80211
depends on CRYPTO
depends on CRYPTO_ARC4
depends on CRYPTO_AES
- select BACKPORT_CRYPTO_CCM
depends on CRC32
select BACKPORT_AVERAGE
---help---
--- a/net/mac80211/aes_ccm.c
+++ b/net/mac80211/aes_ccm.c
@@ -2,8 +2,6 @@
* Copyright 2003-2004, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
*
- * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
- *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
@@ -19,76 +17,134 @@
#include "key.h"
#include "aes_ccm.h"
-void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
- u8 *data, size_t data_len, u8 *mic)
+static void aes_ccm_prepare(struct crypto_cipher *tfm, u8 *scratch, u8 *a)
+{
+ int i;
+ u8 *b_0, *aad, *b, *s_0;
+
+ b_0 = scratch + 3 * AES_BLOCK_SIZE;
+ aad = scratch + 4 * AES_BLOCK_SIZE;
+ b = scratch;
+ s_0 = scratch + AES_BLOCK_SIZE;
+
+ crypto_cipher_encrypt_one(tfm, b, b_0);
+
+ /* Extra Authenticate-only data (always two AES blocks) */
+ for (i = 0; i < AES_BLOCK_SIZE; i++)
+ aad[i] ^= b[i];
+ crypto_cipher_encrypt_one(tfm, b, aad);
+
+ aad += AES_BLOCK_SIZE;
+
+ for (i = 0; i < AES_BLOCK_SIZE; i++)
+ aad[i] ^= b[i];
+ crypto_cipher_encrypt_one(tfm, a, aad);
+
+ /* Mask out bits from auth-only-b_0 */
+ b_0[0] &= 0x07;
+
+ /* S_0 is used to encrypt T (= MIC) */
+ b_0[14] = 0;
+ b_0[15] = 0;
+ crypto_cipher_encrypt_one(tfm, s_0, b_0);
+}
+
+
+void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
+ u8 *data, size_t data_len,
+ u8 *cdata, u8 *mic)
{
- struct scatterlist assoc, pt, ct[2];
+ int i, j, last_len, num_blocks;
+ u8 *pos, *cpos, *b, *s_0, *e, *b_0;
- 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, &pt, ct, data_len, b_0);
+ b = scratch;
+ s_0 = scratch + AES_BLOCK_SIZE;
+ e = scratch + 2 * AES_BLOCK_SIZE;
+ b_0 = scratch + 3 * AES_BLOCK_SIZE;
+
+ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
+ last_len = data_len % AES_BLOCK_SIZE;
+ aes_ccm_prepare(tfm, scratch, b);
+
+ /* Process payload blocks */
+ pos = data;
+ cpos = cdata;
+ for (j = 1; j <= num_blocks; j++) {
+ int blen = (j == num_blocks && last_len) ?
+ last_len : AES_BLOCK_SIZE;
+
+ /* Authentication followed by encryption */
+ for (i = 0; i < blen; i++)
+ b[i] ^= pos[i];
+ crypto_cipher_encrypt_one(tfm, b, b);
+
+ b_0[14] = (j >> 8) & 0xff;
+ b_0[15] = j & 0xff;
+ crypto_cipher_encrypt_one(tfm, e, b_0);
+ for (i = 0; i < blen; i++)
+ *cpos++ = *pos++ ^ e[i];
+ }
- crypto_aead_encrypt(aead_req);
+ for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++)
+ mic[i] = b[i] ^ s_0[i];
}
-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
- u8 *data, size_t data_len, u8 *mic)
+
+int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,
+ u8 *cdata, size_t data_len, u8 *mic, u8 *data)
{
- 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;
+
+ b = scratch;
+ s_0 = scratch + AES_BLOCK_SIZE;
+ a = scratch + 2 * AES_BLOCK_SIZE;
+ b_0 = scratch + 3 * AES_BLOCK_SIZE;
+
+ num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_SIZE);
+ last_len = data_len % AES_BLOCK_SIZE;
+ aes_ccm_prepare(tfm, scratch, a);
+
+ /* Process payload blocks */
+ cpos = cdata;
+ pos = data;
+ for (j = 1; j <= num_blocks; j++) {
+ int blen = (j == num_blocks && last_len) ?
+ last_len : AES_BLOCK_SIZE;
+
+ /* Decryption followed by authentication */
+ b_0[14] = (j >> 8) & 0xff;
+ b_0[15] = j & 0xff;
+ crypto_cipher_encrypt_one(tfm, b, b_0);
+ for (i = 0; i < blen; i++) {
+ *pos = *cpos++ ^ b[i];
+ a[i] ^= *pos++;
+ }
+ crypto_cipher_encrypt_one(tfm, a, a);
+ }
+
+ for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++) {
+ if ((mic[i] ^ s_0[i]) != a[i])
+ return -1;
+ }
- return crypto_aead_decrypt(aead_req);
+ return 0;
}
-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;
-
- 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;
+ tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
+ if (!IS_ERR(tfm))
+ crypto_cipher_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
- crypto_free_aead(tfm);
- return ERR_PTR(err);
+ return tfm;
}
-void ieee80211_aes_key_free(struct crypto_aead *tfm)
+
+void ieee80211_aes_key_free(struct crypto_cipher *tfm)
{
- crypto_free_aead(tfm);
+ crypto_free_cipher(tfm);
}
--- a/net/mac80211/aes_ccm.h
+++ b/net/mac80211/aes_ccm.h
@@ -12,11 +12,13 @@
#include <linux/crypto.h>
-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[]);
-void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
- u8 *data, size_t data_len, u8 *mic);
-int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
- u8 *data, size_t data_len, u8 *mic);
-void ieee80211_aes_key_free(struct crypto_aead *tfm);
+struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[]);
+void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
+ u8 *data, size_t data_len,
+ u8 *cdata, u8 *mic);
+int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,
+ u8 *cdata, size_t data_len,
+ u8 *mic, u8 *data);
+void ieee80211_aes_key_free(struct crypto_cipher *tfm);
#endif /* AES_CCM_H */
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -84,7 +84,7 @@ struct ieee80211_key {
* Management frames.
*/
u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
- struct crypto_aead *tfm;
+ struct crypto_cipher *tfm;
u32 replays; /* dot11RSNAStatsCCMPReplays */
} ccmp;
struct {
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -301,15 +301,22 @@ ieee80211_crypto_tkip_decrypt(struct iee
}
-static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
+static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
+ int encrypted)
{
__le16 mask_fc;
int a4_included, mgmt;
u8 qos_tid;
- u16 len_a;
+ u8 *b_0, *aad;
+ u16 data_len, len_a;
unsigned int hdrlen;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ memset(scratch, 0, 6 * AES_BLOCK_SIZE);
+
+ 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;
}
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