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net/tls: simplify the tls_set_sw_offload function
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Assigning crypto_info variables in advance can simplify the logic
of accessing value and move related local variables to a smaller
scope.

Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Tianjia Zhang authored and David S. Miller committed Nov 30, 2021
1 parent 4047b9d commit dc2724a
Showing 1 changed file with 17 additions and 19 deletions.
36 changes: 17 additions & 19 deletions net/tls/tls_sw.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2328,10 +2328,6 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_prot_info *prot = &tls_ctx->prot_info;
struct tls_crypto_info *crypto_info;
struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
struct tls12_crypto_info_aes_gcm_256 *gcm_256_info;
struct tls12_crypto_info_aes_ccm_128 *ccm_128_info;
struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305_info;
struct tls_sw_context_tx *sw_ctx_tx = NULL;
struct tls_sw_context_rx *sw_ctx_rx = NULL;
struct cipher_context *cctx;
Expand Down Expand Up @@ -2394,15 +2390,15 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)

switch (crypto_info->cipher_type) {
case TLS_CIPHER_AES_GCM_128: {
struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;

gcm_128_info = (void *)crypto_info;
nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
iv = gcm_128_info->iv;
rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
rec_seq =
((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
gcm_128_info =
(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
rec_seq = gcm_128_info->rec_seq;
keysize = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
key = gcm_128_info->key;
salt = gcm_128_info->salt;
Expand All @@ -2411,15 +2407,15 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
break;
}
case TLS_CIPHER_AES_GCM_256: {
struct tls12_crypto_info_aes_gcm_256 *gcm_256_info;

gcm_256_info = (void *)crypto_info;
nonce_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
tag_size = TLS_CIPHER_AES_GCM_256_TAG_SIZE;
iv_size = TLS_CIPHER_AES_GCM_256_IV_SIZE;
iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv;
iv = gcm_256_info->iv;
rec_seq_size = TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE;
rec_seq =
((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->rec_seq;
gcm_256_info =
(struct tls12_crypto_info_aes_gcm_256 *)crypto_info;
rec_seq = gcm_256_info->rec_seq;
keysize = TLS_CIPHER_AES_GCM_256_KEY_SIZE;
key = gcm_256_info->key;
salt = gcm_256_info->salt;
Expand All @@ -2428,15 +2424,15 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
break;
}
case TLS_CIPHER_AES_CCM_128: {
struct tls12_crypto_info_aes_ccm_128 *ccm_128_info;

ccm_128_info = (void *)crypto_info;
nonce_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
tag_size = TLS_CIPHER_AES_CCM_128_TAG_SIZE;
iv_size = TLS_CIPHER_AES_CCM_128_IV_SIZE;
iv = ((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->iv;
iv = ccm_128_info->iv;
rec_seq_size = TLS_CIPHER_AES_CCM_128_REC_SEQ_SIZE;
rec_seq =
((struct tls12_crypto_info_aes_ccm_128 *)crypto_info)->rec_seq;
ccm_128_info =
(struct tls12_crypto_info_aes_ccm_128 *)crypto_info;
rec_seq = ccm_128_info->rec_seq;
keysize = TLS_CIPHER_AES_CCM_128_KEY_SIZE;
key = ccm_128_info->key;
salt = ccm_128_info->salt;
Expand All @@ -2445,6 +2441,8 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
break;
}
case TLS_CIPHER_CHACHA20_POLY1305: {
struct tls12_crypto_info_chacha20_poly1305 *chacha20_poly1305_info;

chacha20_poly1305_info = (void *)crypto_info;
nonce_size = 0;
tag_size = TLS_CIPHER_CHACHA20_POLY1305_TAG_SIZE;
Expand Down

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