mlxsw: spectrum_flower: Forbid to offload match on reserved TCP flags bits

Matching on reserved TCP flags bits is only supported using custom
parser. Since the usecase for that is not known now, just forbid to
offload rules that match on these bits.

Reported-by: Alex Kushnarov <alexanderk@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index c86d582..0ad1a24 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -267,6 +267,12 @@ static int mlxsw_sp_flower_parse_tcp(struct mlxsw_sp *mlxsw_sp,
 
        flow_rule_match_tcp(rule, &match);
 
+       if (match.mask->flags & htons(0x0E00)) {
+               NL_SET_ERR_MSG_MOD(f->common.extack, "TCP flags match not supported on reserved bits");
+               dev_err(mlxsw_sp->bus_info->dev, "TCP flags match not supported on reserved bits\n");
+               return -EINVAL;
+       }
+
        mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_TCP_FLAGS,
                                       ntohs(match.key->flags),
                                       ntohs(match.mask->flags));