diff options
Diffstat (limited to 'package/kernel/mac80211/patches/100-revert_aes_ccm_port.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/100-revert_aes_ccm_port.patch | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/100-revert_aes_ccm_port.patch b/package/kernel/mac80211/patches/100-revert_aes_ccm_port.patch new file mode 100644 index 0000000000..8268bbd489 --- /dev/null +++ b/package/kernel/mac80211/patches/100-revert_aes_ccm_port.patch @@ -0,0 +1,347 @@ +--- 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 +- depends on 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. +@@ -19,75 +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) + { +- struct scatterlist assoc, pt, ct[2]; +- struct { +- struct aead_request req; +- u8 priv[crypto_aead_reqsize(tfm)]; +- } aead_req; +- +- memset(&aead_req, 0, sizeof(aead_req)); +- +- 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.req, tfm); +- aead_request_set_assoc(&aead_req.req, &assoc, assoc.length); +- aead_request_set_crypt(&aead_req.req, &pt, ct, data_len, b_0); ++ int i; ++ u8 *b_0, *aad, *b, *s_0; + +- crypto_aead_encrypt(&aead_req.req); ++ 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); + } + +-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_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch, ++ u8 *data, size_t data_len, ++ u8 *cdata, u8 *mic) + { +- struct scatterlist assoc, pt, ct[2]; +- struct { +- struct aead_request req; +- u8 priv[crypto_aead_reqsize(tfm)]; +- } aead_req; +- +- memset(&aead_req, 0, sizeof(aead_req)); +- +- 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.req, tfm); +- aead_request_set_assoc(&aead_req.req, &assoc, assoc.length); +- aead_request_set_crypt(&aead_req.req, ct, &pt, +- data_len + IEEE80211_CCMP_MIC_LEN, b_0); ++ int i, j, last_len, num_blocks; ++ u8 *pos, *cpos, *b, *s_0, *e, *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]; ++ } + +- return crypto_aead_decrypt(&aead_req.req); ++ for (i = 0; i < IEEE80211_CCMP_MIC_LEN; i++) ++ mic[i] = b[i] ^ s_0[i]; + } + +-struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[]) ++ ++int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch, ++ u8 *cdata, size_t data_len, u8 *mic, u8 *data) + { +- struct crypto_aead *tfm; +- int err; ++ 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; ++ 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; ++ } + +- crypto_free_aead(tfm); +- return ERR_PTR(err); ++ return 0; + } + +-void ieee80211_aes_key_free(struct crypto_aead *tfm) ++ ++struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[]) ++{ ++ struct crypto_cipher *tfm; ++ ++ tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); ++ if (!IS_ERR(tfm)) ++ crypto_cipher_setkey(tfm, key, WLAN_KEY_LEN_CCMP); ++ ++ return 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 +@@ -83,7 +83,7 @@ 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 +@@ -301,16 +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 +@@ -332,21 +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] */ +@@ -402,8 +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) && +@@ -456,9 +460,9 @@ static int ccmp_encrypt_skb(struct ieee8 + return 0; + + pos += IEEE80211_CCMP_HDR_LEN; +- ccmp_special_blocks(skb, pn, b_0, aad, 0); +- 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; + } +@@ -521,16 +525,16 @@ 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, 1); ++ 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; + } + |