net: phy: mscc: macsec: reject PN update requests

[ Upstream commit e0a8c918daa58700609ebd45e3fcd49965be8bbc ]

Updating the PN is not supported.
Return -EINVAL if update_pn is true.

The following command succeeded, but it should fail because the driver
does not update the PN:
ip macsec set macsec0 tx sa 0 pn 232 on

Fixes: 28c5107aa904 ("net: phy: mscc: macsec support")
Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/phy/mscc/mscc_macsec.c b/drivers/net/phy/mscc/mscc_macsec.c
index f81b077..81fd9bf 100644 (file)
--- a/drivers/net/phy/mscc/mscc_macsec.c
+++ b/drivers/net/phy/mscc/mscc_macsec.c
@@ -844,6 +844,9 @@ static int vsc8584_macsec_upd_rxsa(struct macsec_context *ctx)
        struct macsec_flow *flow;
        int ret;
 
+       if (ctx->sa.update_pn)
+               return -EINVAL;
+
        flow = vsc8584_macsec_find_flow(ctx, MACSEC_INGR);
        if (IS_ERR(flow))
                return PTR_ERR(flow);
@@ -897,6 +900,9 @@ static int vsc8584_macsec_upd_txsa(struct macsec_context *ctx)
        struct macsec_flow *flow;
        int ret;
 
+       if (ctx->sa.update_pn)
+               return -EINVAL;
+
        flow = vsc8584_macsec_find_flow(ctx, MACSEC_EGR);
        if (IS_ERR(flow))
                return PTR_ERR(flow);