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tls: extend tls_cipher_desc to fully describe the ciphers

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- add nonce, usually equal to iv_size but not for chacha
 - add offsets into the crypto_info for each field
 - add algorithm name
 - add offloadable flag

Also add helpers to access each field of a crypto_info struct
described by a tls_cipher_desc.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/39d5f476d63c171097764e8d38f6f158b7c109ae.1692977948.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sabrina Dubroca 2023-08-25 23:35:13 +02:00 committed by Jakub Kicinski
parent 8db44ab26b
commit 176a3f50bc
2 changed files with 64 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

32
net/tls/tls.h
View file

@ -52,11 +52,19 @@
SNMP_DEC_STATS((net)->mib.tls_statistics, field)
struct tls_cipher_desc {
unsigned int nonce;
unsigned int iv;
unsigned int key;
unsigned int salt;
unsigned int tag;
unsigned int rec_seq;
unsigned int iv_offset;
unsigned int key_offset;
unsigned int salt_offset;
unsigned int rec_seq_offset;
char *cipher_name;
bool offloadable;
size_t crypto_info;
};
#define TLS_CIPHER_MIN TLS_CIPHER_AES_GCM_128
@ -71,6 +79,30 @@ static inline const struct tls_cipher_desc *get_cipher_desc(u16 cipher_type)
return &tls_cipher_desc[cipher_type - TLS_CIPHER_MIN];
}
static inline char *crypto_info_iv(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->iv_offset;
}
static inline char *crypto_info_key(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->key_offset;
}
static inline char *crypto_info_salt(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->salt_offset;
}
static inline char *crypto_info_rec_seq(struct tls_crypto_info *crypto_info,
const struct tls_cipher_desc *cipher_desc)
{
return (char *)crypto_info + cipher_desc->rec_seq_offset;
}
/* TLS records are maintained in 'struct tls_rec'. It stores the memory pages
* allocated or mapped for each TLS record. After encryption, the records are

41
net/tls/tls_main.c
View file

@ -58,23 +58,46 @@ enum {
TLS_NUM_PROTS,
};
#define CIPHER_DESC(cipher) [cipher - TLS_CIPHER_MIN] = { \
#define __CIPHER_DESC(ci) \
.iv_offset = offsetof(struct ci, iv), \
.key_offset = offsetof(struct ci, key), \
.salt_offset = offsetof(struct ci, salt), \
.rec_seq_offset = offsetof(struct ci, rec_seq), \
.crypto_info = sizeof(struct ci)
#define CIPHER_DESC(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = { \
.nonce = cipher ## _IV_SIZE, \
.iv = cipher ## _IV_SIZE, \
.key = cipher ## _KEY_SIZE, \
.salt = cipher ## _SALT_SIZE, \
.tag = cipher ## _TAG_SIZE, \
.rec_seq = cipher ## _REC_SEQ_SIZE, \
.cipher_name = algname, \
.offloadable = _offloadable, \
__CIPHER_DESC(ci), \
}
#define CIPHER_DESC_NONCE0(cipher,ci,algname,_offloadable) [cipher - TLS_CIPHER_MIN] = { \
.nonce = 0, \
.iv = cipher ## _IV_SIZE, \
.key = cipher ## _KEY_SIZE, \
.salt = cipher ## _SALT_SIZE, \
.tag = cipher ## _TAG_SIZE, \
.rec_seq = cipher ## _REC_SEQ_SIZE, \
.cipher_name = algname, \
.offloadable = _offloadable, \
__CIPHER_DESC(ci), \
}
const struct tls_cipher_desc tls_cipher_desc[TLS_CIPHER_MAX + 1 - TLS_CIPHER_MIN] = {
CIPHER_DESC(TLS_CIPHER_AES_GCM_128),
CIPHER_DESC(TLS_CIPHER_AES_GCM_256),
CIPHER_DESC(TLS_CIPHER_AES_CCM_128),
CIPHER_DESC(TLS_CIPHER_CHACHA20_POLY1305),
CIPHER_DESC(TLS_CIPHER_SM4_GCM),
CIPHER_DESC(TLS_CIPHER_SM4_CCM),
CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128),
CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256),
CIPHER_DESC(TLS_CIPHER_AES_GCM_128, tls12_crypto_info_aes_gcm_128, "gcm(aes)", true),
CIPHER_DESC(TLS_CIPHER_AES_GCM_256, tls12_crypto_info_aes_gcm_256, "gcm(aes)", true),
CIPHER_DESC(TLS_CIPHER_AES_CCM_128, tls12_crypto_info_aes_ccm_128, "ccm(aes)", false),
CIPHER_DESC_NONCE0(TLS_CIPHER_CHACHA20_POLY1305, tls12_crypto_info_chacha20_poly1305, "rfc7539(chacha20,poly1305)", false),
CIPHER_DESC(TLS_CIPHER_SM4_GCM, tls12_crypto_info_sm4_gcm, "gcm(sm4)", false),
CIPHER_DESC(TLS_CIPHER_SM4_CCM, tls12_crypto_info_sm4_ccm, "ccm(sm4)", false),
CIPHER_DESC(TLS_CIPHER_ARIA_GCM_128, tls12_crypto_info_aria_gcm_128, "gcm(aria)", false),
CIPHER_DESC(TLS_CIPHER_ARIA_GCM_256, tls12_crypto_info_aria_gcm_256, "gcm(aria)", false),
};
static const struct proto *saved_tcpv6_prot;