IB/mlx4: Add validation to flow specifications parsing

Add validation check that all set fields in flow specification
are supported by vendor.

Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index a96e78c2c75a..f617c23f0be7 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -1361,6 +1361,19 @@ struct mlx4_ib_steering {
         union ib_gid gid;
 };
 
+#define LAST_ETH_FIELD vlan_tag
+#define LAST_IB_FIELD sl
+#define LAST_IPV4_FIELD dst_ip
+#define LAST_TCP_UDP_FIELD src_port
+
+/* Field is the last supported field */
+#define FIELDS_NOT_SUPPORTED(filter, field)\
+        memchr_inv((void *)&filter.field  +\
+                   sizeof(filter.field), 0,\
+                   sizeof(filter) -\
+                   offsetof(typeof(filter), field) -\
+                   sizeof(filter.field))
+
 static int parse_flow_attr(struct mlx4_dev *dev,
                            u32 qp_num,
                            union ib_flow_spec *ib_spec,
@@ -1370,6 +1383,9 @@ static int parse_flow_attr(struct mlx4_dev *dev,
 
         switch (ib_spec->type) {
         case IB_FLOW_SPEC_ETH:
+                if (FIELDS_NOT_SUPPORTED(ib_spec->eth.mask, LAST_ETH_FIELD))
+                        return -ENOTSUPP;
+
                 type = MLX4_NET_TRANS_RULE_ID_ETH;
                 memcpy(mlx4_spec->eth.dst_mac, ib_spec->eth.val.dst_mac,
                        ETH_ALEN);
@@ -1379,6 +1395,9 @@ static int parse_flow_attr(struct mlx4_dev *dev,
                 mlx4_spec->eth.vlan_tag_msk = ib_spec->eth.mask.vlan_tag;
                 break;
         case IB_FLOW_SPEC_IB:
+                if (FIELDS_NOT_SUPPORTED(ib_spec->ib.mask, LAST_IB_FIELD))
+                        return -ENOTSUPP;
+
                 type = MLX4_NET_TRANS_RULE_ID_IB;
                 mlx4_spec->ib.l3_qpn =
                         cpu_to_be32(qp_num);
@@ -1388,6 +1407,9 @@ static int parse_flow_attr(struct mlx4_dev *dev,
 
 
         case IB_FLOW_SPEC_IPV4:
+                if (FIELDS_NOT_SUPPORTED(ib_spec->ipv4.mask, LAST_IPV4_FIELD))
+                        return -ENOTSUPP;
+
                 type = MLX4_NET_TRANS_RULE_ID_IPV4;
                 mlx4_spec->ipv4.src_ip = ib_spec->ipv4.val.src_ip;
                 mlx4_spec->ipv4.src_ip_msk = ib_spec->ipv4.mask.src_ip;
@@ -1397,6 +1419,9 @@ static int parse_flow_attr(struct mlx4_dev *dev,
 
         case IB_FLOW_SPEC_TCP:
         case IB_FLOW_SPEC_UDP:
+                if (FIELDS_NOT_SUPPORTED(ib_spec->tcp_udp.mask, LAST_TCP_UDP_FIELD))
+                        return -ENOTSUPP;
+
                 type = ib_spec->type == IB_FLOW_SPEC_TCP ?
                                         MLX4_NET_TRANS_RULE_ID_TCP :
                                         MLX4_NET_TRANS_RULE_ID_UDP;