tap: Fix tap create with ns

[vpp.git] / src / vnet / devices / tap / tap.c

diff --git a/src/vnet/devices/tap/tap.c b/src/vnet/devices/tap/tap.c
index 014c1f0..8bd03aa 100644 (file)
--- a/src/vnet/devices/tap/tap.c
+++ b/src/vnet/devices/tap/tap.c
@@ -201,23 +201,26 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
          err = clib_error_return (0, "host_if_name is not provided");
          goto error;
        }
-      if (args->host_namespace)
+    }
+
+  /* if namespace is specified, all further netlink messages should be executed
+   * after we change our net namespace */
+  if (args->host_namespace)
+    {
+      old_netns_fd = clib_netns_open (NULL /* self */);
+      if ((nfd = clib_netns_open (args->host_namespace)) == -1)
        {
-         old_netns_fd = clib_netns_open (NULL /* self */);
-         if ((nfd = clib_netns_open (args->host_namespace)) == -1)
-           {
-             args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
-             args->error = clib_error_return_unix (0, "clib_netns_open '%s'",
-                                                   args->host_namespace);
-             goto error;
-           }
-         if (clib_setns (nfd) == -1)
-           {
-             args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
-             args->error = clib_error_return_unix (0, "setns '%s'",
-                                                   args->host_namespace);
-             goto error;
-           }
+         args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
+         args->error = clib_error_return_unix (0, "clib_netns_open '%s'",
+                                               args->host_namespace);
+         goto error;
+       }
+      if (clib_setns (nfd) == -1)
+       {
+         args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
+         args->error =
+           clib_error_return_unix (0, "setns '%s'", args->host_namespace);
+         goto error;
        }
     }
 
@@ -400,44 +403,6 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
 
   virtio_set_net_hdr_size (vif);
 
-  if (!(args->tap_flags & TAP_FLAG_ATTACH))
-    {
-      /* if namespace is specified, all further netlink messages should be executed
-         after we change our net namespace */
-      if (args->host_namespace)
-       {
-         old_netns_fd = clib_netns_open (NULL /* self */);
-         if ((nfd = clib_netns_open (args->host_namespace)) == -1)
-           {
-             args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
-             args->error = clib_error_return_unix (0, "clib_netns_open '%s'",
-                                                   args->host_namespace);
-             goto error;
-           }
-         args->error = vnet_netlink_set_link_netns (vif->ifindex, nfd,
-                                                    host_if_name);
-         if (args->error)
-           {
-             args->rv = VNET_API_ERROR_NETLINK_ERROR;
-             goto error;
-           }
-         if (clib_setns (nfd) == -1)
-           {
-             args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
-             args->error = clib_error_return_unix (0, "setns '%s'",
-                                                   args->host_namespace);
-             goto error;
-           }
-         if ((vif->ifindex = if_nametoindex (host_if_name)) == 0)
-           {
-             args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
-             args->error = clib_error_return_unix (0, "if_nametoindex '%s'",
-                                                   host_if_name);
-             goto error;
-           }
-       }
-    }
-
   if (vif->type == VIRTIO_IF_TYPE_TAP)
     {
       if (ethernet_mac_address_is_zero (args->host_mac_addr.bytes))
@@ -757,7 +722,11 @@ done:
   if (vhost_mem)
     clib_mem_free (vhost_mem);
   if (old_netns_fd != -1)
-    close (old_netns_fd);
+    {
+      /* in case we errored with a switched netns */
+      clib_setns (old_netns_fd);
+      close (old_netns_fd);
+    }
   if (nfd != -1)
     close (nfd);
 }