netdev - [PATCH net-next 2/2] xfrm: Add support for SM4 symmetric cipher algorithm

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Date:   Wed, 22 Dec 2021 17:06:59 +0800
From:   Xu Jia <xujia39@...wei.com>
To:     <steffen.klassert@...unet.com>, <herbert@...dor.apana.org.au>,
        <davem@...emloft.net>, <kuba@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH net-next 2/2] xfrm: Add support for SM4 symmetric cipher algorithm

This patch adds SM4 encryption algorithm entry to ealg_list.

Signed-off-by: Xu Jia <xujia39@...wei.com>
---
 include/uapi/linux/pfkeyv2.h |  1 +
 net/xfrm/xfrm_algo.c         | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/uapi/linux/pfkeyv2.h b/include/uapi/linux/pfkeyv2.h
index 798ba9f..8abae1f 100644
--- a/include/uapi/linux/pfkeyv2.h
+++ b/include/uapi/linux/pfkeyv2.h
@@ -330,6 +330,7 @@ struct sadb_x_filter {
 #define SADB_X_EALG_AES_GCM_ICV16	20
 #define SADB_X_EALG_CAMELLIACBC		22
 #define SADB_X_EALG_NULL_AES_GMAC	23
+#define SADB_X_EALG_SM4CBC		24
 #define SADB_EALG_MAX                   253 /* last EALG */
 /* private allocations should use 249-255 (RFC2407) */
 #define SADB_X_EALG_SERPENTCBC  252     /* draft-ietf-ipsec-ciph-aes-cbc-00 */
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index 00b5444..094734f 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -572,6 +572,27 @@
 		.sadb_alg_maxbits = 288
 	}
 },
+{
+	.name = "cbc(sm4)",
+	.compat = "sm4",
+
+	.uinfo = {
+		.encr = {
+			.geniv = "echainiv",
+			.blockbits = 128,
+			.defkeybits = 128,
+		}
+	},
+
+	.pfkey_supported = 1,
+
+	.desc = {
+		.sadb_alg_id = SADB_X_EALG_SM4CBC,
+		.sadb_alg_ivlen	= 16,
+		.sadb_alg_minbits = 128,
+		.sadb_alg_maxbits = 256
+	}
+},
 };
 
 static struct xfrm_algo_desc calg_list[] = {
-- 
1.8.3.1