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IB/core: Don't resolve IP address to the loopback device

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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@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Moni Shoua
2017-05-23 10:48:45 +03:00
committed by Doug Ledford
parent bebb2a473a
commit cbd09aebc2
3 changed files with 32 additions and 45 deletions
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40
drivers/infiniband/core/addr.c
View File

@ -268,6 +268,7 @@ 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);
@ -280,6 +281,7 @@ 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;
@ -405,10 +407,10 @@ 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;
@ -423,8 +425,6 @@ static int addr4_resolve(struct sockaddr_in *src_in,
*prt = rt;
return 0;
out:
return ret;
}
#if IS_ENABLED(CONFIG_IPV6)
@ -527,8 +527,12 @@ 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 {
@ -544,13 +548,27 @@ 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;

32
drivers/infiniband/core/cma.c
View File

@ -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);
@ -2569,21 +2558,6 @@ 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,

5
drivers/infiniband/core/verbs.c
View File

@ -520,11 +520,6 @@ 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))