netdev - [PATCH net-next v2 10/13] macsec: use NLA_POLICY_VALIDATE_FN to validate IFLA_MACSEC_CIPHER

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Message-ID: <015e43ade9548c7682c9739087eba0853b3a1331.1756202772.git.sd@queasysnail.net>
Date: Tue, 26 Aug 2025 15:16:28 +0200
From: Sabrina Dubroca <sd@...asysnail.net>
To: netdev@...r.kernel.org
Cc: Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net-next v2 10/13] macsec: use NLA_POLICY_VALIDATE_FN to validate IFLA_MACSEC_CIPHER_SUITE

Unfortunately, since the value of MACSEC_DEFAULT_CIPHER_ID doesn't fit
near the others, we can't use a simple range in the policy.

Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
 drivers/net/macsec.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

v2: remove unused csid variable (spotted by Jakub Kicinski and kernel
    test robot)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 9589e8f9a8c9..5680e4b78dda 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3757,11 +3757,13 @@ static const struct device_type macsec_type = {
 	.name = "macsec",
 };
 
+static int validate_cipher_suite(const struct nlattr *attr,
+				 struct netlink_ext_ack *extack);
 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
 	[IFLA_MACSEC_SCI] = { .type = NLA_U64 },
 	[IFLA_MACSEC_PORT] = { .type = NLA_U16 },
 	[IFLA_MACSEC_ICV_LEN] = NLA_POLICY_RANGE(NLA_U8, MACSEC_MIN_ICV_LEN, MACSEC_STD_ICV_LEN),
-	[IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
+	[IFLA_MACSEC_CIPHER_SUITE] = NLA_POLICY_VALIDATE_FN(NLA_U64, validate_cipher_suite),
 	[IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
 	[IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
 	[IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
@@ -4225,10 +4227,24 @@ static int macsec_newlink(struct net_device *dev,
 	return err;
 }
 
+static int validate_cipher_suite(const struct nlattr *attr,
+				 struct netlink_ext_ack *extack)
+{
+	switch (nla_get_u64(attr)) {
+	case MACSEC_CIPHER_ID_GCM_AES_128:
+	case MACSEC_CIPHER_ID_GCM_AES_256:
+	case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
+	case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
+	case MACSEC_DEFAULT_CIPHER_ID:
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
 				struct netlink_ext_ack *extack)
 {
-	u64 csid = MACSEC_DEFAULT_CIPHER_ID;
 	u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
 	int flag;
 	bool es, scb, sci;
@@ -4236,9 +4252,6 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
 	if (!data)
 		return 0;
 
-	if (data[IFLA_MACSEC_CIPHER_SUITE])
-		csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
-
 	if (data[IFLA_MACSEC_ICV_LEN]) {
 		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
 		if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
@@ -4254,17 +4267,6 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
 		}
 	}
 
-	switch (csid) {
-	case MACSEC_CIPHER_ID_GCM_AES_128:
-	case MACSEC_CIPHER_ID_GCM_AES_256:
-	case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
-	case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
-	case MACSEC_DEFAULT_CIPHER_ID:
-		break;
-	default:
-		return -EINVAL;
-	}
-
 	if (data[IFLA_MACSEC_ENCODING_SA]) {
 		if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
 			return -EINVAL;
-- 
2.50.0