zebra: upon NS creation, collect the NSID via netlink

A NS identifier is collected by netlink. This identifier is a 32 bit
identifier that is either generated by the kernel (if not set) or
manually set by a set netlink command. The commit here is getting the
NSID from the newly created NS. If the linux option to create or get a
new NSID from the kernel does not exist, then the NSID is locally
genrated.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/zebra/zebra_netns_id.h b/zebra/zebra_netns_id.h
new file mode 100644
index 000000000..18fdf50cf
--- /dev/null
+++ b/zebra/zebra_netns_id.h
@@ -0,0 +1,25 @@
+/* zebra NETNS ID handling routines
+ * Copyright (C) 2018 6WIND
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#if !defined(__ZEBRA_NS_ID_H__)
+#define __ZEBRA_NS_ID_H__
+#include "zebra.h"
+#include "ns.h"
+
+extern ns_id_t zebra_ns_id_get(const char *netnspath);
+
+#endif /* __ZEBRA_NS_ID_H__ */