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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/crypto/gcm.h
..
..
@@ -1,8 +1,63 @@
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 #ifndef _CRYPTO_GCM_H
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 #define _CRYPTO_GCM_H
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3
 
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+#include <linux/errno.h>
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+
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 #define GCM_AES_IV_SIZE 12
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 #define GCM_RFC4106_IV_SIZE 8
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 #define GCM_RFC4543_IV_SIZE 8
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+/*
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+ * validate authentication tag for GCM
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+ */
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+static inline int crypto_gcm_check_authsize(unsigned int authsize)
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+{
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+	switch (authsize) {
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+	case 4:
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+	case 8:
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+	case 12:
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+	case 13:
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+	case 14:
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+	case 15:
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+	case 16:
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+		break;
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+	default:
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+		return -EINVAL;
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+	}
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+
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+	return 0;
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+}
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+
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+/*
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+ * validate authentication tag for RFC4106
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+ */
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+static inline int crypto_rfc4106_check_authsize(unsigned int authsize)
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+{
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+	switch (authsize) {
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+	case 8:
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+	case 12:
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+	case 16:
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+		break;
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+	default:
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+		return -EINVAL;
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+	}
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+
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+	return 0;
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+}
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+
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+/*
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+ * validate assoclen for RFC4106/RFC4543
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+ */
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+static inline int crypto_ipsec_check_assoclen(unsigned int assoclen)
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+{
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+	switch (assoclen) {
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+	case 16:
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+	case 20:
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+		break;
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+	default:
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+		return -EINVAL;
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+	}
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+
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+	return 0;
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+}
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 #endif