netdev - [PATCH net-next 1/4] net/tls: Describe ciphers sizes by const structs

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Date:   Wed, 14 Sep 2022 12:05:17 +0300
From:   Gal Pressman <gal@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>, Gal Pressman <gal@...dia.com>
Subject: [PATCH net-next 1/4] net/tls: Describe ciphers sizes by const structs

From: Tariq Toukan <tariqt@...dia.com>

Introduce cipher sizes descriptor. It helps reducing the amount of code
duplications and repeated switch/cases that assigns the proper sizes
according to the cipher type.

Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Gal Pressman <gal@...dia.com>
---
 include/net/tls.h  | 10 ++++++++++
 net/tls/tls_main.c | 17 +++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/net/tls.h b/include/net/tls.h
index cb205f9d9473..154949c7b0c8 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -51,6 +51,16 @@
 
 struct tls_rec;
 
+struct tls_cipher_size_desc {
+	unsigned int iv;
+	unsigned int key;
+	unsigned int salt;
+	unsigned int tag;
+	unsigned int rec_seq;
+};
+
+extern const struct tls_cipher_size_desc tls_cipher_size_desc[];
+
 /* Maximum data size carried in a TLS record */
 #define TLS_MAX_PAYLOAD_SIZE		((size_t)1 << 14)
 
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 08ddf9d837ae..97630def210d 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -58,6 +58,23 @@ enum {
 	TLS_NUM_PROTS,
 };
 
+#define CIPHER_SIZE_DESC(cipher) [cipher] { \
+	.iv = cipher ## _IV_SIZE, \
+	.key = cipher ## _KEY_SIZE, \
+	.salt = cipher ## _SALT_SIZE, \
+	.tag = cipher ## _TAG_SIZE, \
+	.rec_seq = cipher ## _REC_SEQ_SIZE, \
+}
+
+const struct tls_cipher_size_desc tls_cipher_size_desc[] = {
+	CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_128),
+	CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_256),
+	CIPHER_SIZE_DESC(TLS_CIPHER_AES_CCM_128),
+	CIPHER_SIZE_DESC(TLS_CIPHER_CHACHA20_POLY1305),
+	CIPHER_SIZE_DESC(TLS_CIPHER_SM4_GCM),
+	CIPHER_SIZE_DESC(TLS_CIPHER_SM4_CCM),
+};
+
 static const struct proto *saved_tcpv6_prot;
 static DEFINE_MUTEX(tcpv6_prot_mutex);
 static const struct proto *saved_tcpv4_prot;
-- 
2.25.1