RDMA/uverbs: Check CAP_NET_RAW in user namespace for RAW QP create

Currently, the capability check is done in the default
init_user_ns user namespace. When a process runs in a
non default user namespace, such check fails. Due to this
when a process is running using Podman, it fails to create
the QP.

Since the RDMA device is a resource within a network namespace,
use the network namespace associated with the RDMA device to
determine its owning user namespace.

Fixes: 6d1e7ba241e9 ("IB/uverbs: Introduce create/destroy QP commands over ioctl")
Signed-off-by: Parav Pandit <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/core/uverbs_std_types_qp.c

···
 		device = xrcd->device;
 		break;
 	case IB_UVERBS_QPT_RAW_PACKET:
-		if (!capable(CAP_NET_RAW))
+		if (!rdma_uattrs_has_raw_cap(attrs))
 			return -EPERM;
 		fallthrough;
 	case IB_UVERBS_QPT_RC: