From: Moni Shoua <monis@xxxxxxxxxxxx>
When resolving an IP address that is on the host of the caller the
result from querying the routing table is the loopback device. This is
not a valid response, because it doesn't represent the RDMA device and
the port.
Therefore, callers need to check the resolved device and if it is a
loopback device find an alternative way to resolve it. To avoid this we
make sure that the response from rdma_resolve_ip() will not be the
loopback device.
While that, we fix an static checker warning about dereferencing an
unintitialized pointer using the same solution as in commit abeffce90c7f
("net/mlx5e: Fix a -Wmaybe-uninitialized warning") as a reference.
Signed-off-by: Moni Shoua <monis@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
---
drivers/infiniband/core/addr.c | 40 +++++++++++++++++++++++++++++-----------
drivers/infiniband/core/cma.c | 32 +++-----------------------------
drivers/infiniband/core/verbs.c | 5 -----
3 files changed, 32 insertions(+), 45 deletions(-)
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index d2afcb3dd81a..283ebe8f4783 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -269,6 +269,7 @@ int rdma_translate_ip(const struct sockaddr *addr,
return ret;
ret = rdma_copy_addr(dev_addr, dev, NULL);
+ dev_addr->bound_dev_if = dev->ifindex;
if (vlan_id)
*vlan_id = rdma_vlan_dev_vlan_id(dev);
dev_put(dev);
@@ -281,6 +282,7 @@ int rdma_translate_ip(const struct sockaddr *addr,
&((const struct sockaddr_in6 *)addr)->sin6_addr,
dev, 1)) {
ret = rdma_copy_addr(dev_addr, dev, NULL);
+ dev_addr->bound_dev_if = dev->ifindex;
if (vlan_id)
*vlan_id = rdma_vlan_dev_vlan_id(dev);
break;
@@ -406,10 +408,10 @@ static int addr4_resolve(struct sockaddr_in *src_in,
fl4.saddr = src_ip;
fl4.flowi4_oif = addr->bound_dev_if;
rt = ip_route_output_key(addr->net, &fl4);
- if (IS_ERR(rt)) {
- ret = PTR_ERR(rt);
- goto out;
- }
+ ret = PTR_ERR_OR_ZERO(rt);
+ if (ret)
+ return ret;
+
src_in->sin_family = AF_INET;
src_in->sin_addr.s_addr = fl4.saddr;
@@ -424,8 +426,6 @@ static int addr4_resolve(struct sockaddr_in *src_in,
*prt = rt;
return 0;
-out:
- return ret;
}
#if IS_ENABLED(CONFIG_IPV6)
@@ -536,8 +536,12 @@ static int addr_resolve(struct sockaddr *src_in,
if (resolve_neigh)
ret = addr_resolve_neigh(&rt->dst, dst_in, addr, seq);
- ndev = rt->dst.dev;
- dev_hold(ndev);
+ if (addr->bound_dev_if) {
+ ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
+ } else {
+ ndev = rt->dst.dev;
+ dev_hold(ndev);
+ }
ip_rt_put(rt);
} else {
@@ -553,13 +557,27 @@ static int addr_resolve(struct sockaddr *src_in,
if (resolve_neigh)
ret = addr_resolve_neigh(dst, dst_in, addr, seq);
- ndev = dst->dev;
- dev_hold(ndev);
+ if (addr->bound_dev_if) {
+ ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
+ } else {
+ ndev = dst->dev;
+ dev_hold(ndev);
+ }
dst_release(dst);
}
- addr->bound_dev_if = ndev->ifindex;
+ if (ndev->flags & IFF_LOOPBACK) {
+ ret = rdma_translate_ip(dst_in, addr, NULL);
+ /*
+ * Put the loopback device and get the translated
+ * device instead.
+ */
+ dev_put(ndev);
+ ndev = dev_get_by_index(addr->net, addr->bound_dev_if);
+ } else {
+ addr->bound_dev_if = ndev->ifindex;
+ }
dev_put(ndev);
return ret;
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 91b7a2fe5a55..2a6dc10c5624 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -623,22 +623,11 @@ static inline int cma_validate_port(struct ib_device *device, u8 port,
if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
return ret;
- if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
+ if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port))
ndev = dev_get_by_index(&init_net, bound_if_index);
- if (ndev && ndev->flags & IFF_LOOPBACK) {
- pr_info("detected loopback device\n");
- dev_put(ndev);
-
- if (!device->get_netdev)
- return -EOPNOTSUPP;
-
- ndev = device->get_netdev(device, port);
- if (!ndev)
- return -ENODEV;
- }
- } else {
+ else
gid_type = IB_GID_TYPE_IB;
- }
+
ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
ndev, NULL);
@@ -2570,21 +2559,6 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
goto err2;
}
- if (ndev->flags & IFF_LOOPBACK) {
- dev_put(ndev);
- if (!id_priv->id.device->get_netdev) {
- ret = -EOPNOTSUPP;
- goto err2;
- }
-
- ndev = id_priv->id.device->get_netdev(id_priv->id.device,
- id_priv->id.port_num);
- if (!ndev) {
- ret = -ENODEV;
- goto err2;
- }
- }
-
supported_gids = roce_gid_type_mask_support(id_priv->id.device,
id_priv->id.port_num);
gid_type = cma_route_gid_type(addr->dev_addr.network,
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 4792f5209ac2..3d1389efa777 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -506,11 +506,6 @@ int ib_init_ah_from_wc(struct ib_device *device, u8 port_num,
}
resolved_dev = dev_get_by_index(&init_net, if_index);
- if (resolved_dev->flags & IFF_LOOPBACK) {
- dev_put(resolved_dev);
- resolved_dev = idev;
- dev_hold(resolved_dev);
- }
rcu_read_lock();
if (resolved_dev != idev && !rdma_is_upper_dev_rcu(idev,
resolved_dev))
--
2.12.2