zebra: Layer-2 interface handling

Define interface types of interest and recognize the types. Store layer-2
information (VLAN Id, VNI etc.) for interfaces, process bridge interfaces
and map bridge members to bridge. Display all the additional information
to user (through "show interface").

Note: Only implemented for the netlink interface.

Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>
Reviewed-by:   Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 94 insertions, 0 deletions

diff --git a/zebra/zebra_l2.h b/zebra/zebra_l2.h
new file mode 100644
index 000000000..5cfc6dee4
--- /dev/null
+++ b/zebra/zebra_l2.h
@@ -0,0 +1,94 @@
+/*
+ * Zebra Layer-2 interface Data structures and definitions
+ * Copyright (C) 2016, 2017 Cumulus Networks, Inc.
+ *
+ * This file is part of FRR.
+ *
+ * FRR 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, or (at your option) any
+ * later version.
+ *
+ * FRR 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 FRR; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef _ZEBRA_L2_H
+#define _ZEBRA_L2_H
+
+#include <zebra.h>
+
+#include "if.h"
+#include "vlan.h"
+#include "vxlan.h"
+
+/* zebra L2 interface information - bridge slave (linkage to bridge) */
+struct zebra_l2info_brslave
+{
+  ifindex_t bridge_ifindex;   /* Bridge Master */
+  struct interface *br_if;    /* Pointer to master */
+};
+
+/* zebra L2 interface information - bridge interface */
+struct zebra_l2info_bridge
+{
+  u_char vlan_aware;          /* VLAN-aware bridge? */
+};
+
+/* zebra L2 interface information - VLAN interface */
+struct zebra_l2info_vlan
+{
+  vlanid_t vid;                  /* VLAN id */
+};
+
+/* zebra L2 interface information - VXLAN interface */
+struct zebra_l2info_vxlan
+{
+  vni_t vni;                     /* VNI */
+  struct in_addr vtep_ip;        /* Local tunnel IP */
+  vlanid_t access_vlan;          /* Access VLAN - for VLAN-aware bridge. */
+};
+
+union zebra_l2if_info
+{
+  struct zebra_l2info_bridge  br;
+  struct zebra_l2info_vlan    vl;
+  struct zebra_l2info_vxlan   vxl;
+};
+
+/* NOTE: These macros are to be invoked only in the "correct" context.
+ * IOW, the macro VNI_FROM_ZEBRA_IF() will assume the interface is
+ * of type ZEBRA_IF_VXLAN.
+ */
+#define VNI_FROM_ZEBRA_IF(zif) (zif)->l2info.vxl.vni
+#define VLAN_ID_FROM_ZEBRA_IF(zif) (zif)->l2info.vl.vid
+
+#define IS_ZEBRA_IF_BRIDGE_VLAN_AWARE(zif) \
+        ((zif)->l2info.br.vlan_aware == 1)
+
+
+extern void zebra_l2_map_slave_to_bridge (struct zebra_l2info_brslave *br_slave);
+extern void zebra_l2_unmap_slave_from_bridge (struct zebra_l2info_brslave *br_slave);
+extern void zebra_l2_bridge_add_update (struct interface *ifp,
+                                        struct zebra_l2info_bridge *bridge_info,
+                                        int add);
+extern void zebra_l2_bridge_del (struct interface *ifp);
+extern void zebra_l2_vlanif_update (struct interface *ifp,
+                                    struct zebra_l2info_vlan *vlan_info);
+extern void zebra_l2_vxlanif_add_update (struct interface *ifp,
+                                         struct zebra_l2info_vxlan *vxlan_info,
+                                         int add);
+extern void zebra_l2_vxlanif_update_access_vlan (struct interface *ifp,
+                                                 vlanid_t access_vlan);
+extern void zebra_l2_vxlanif_del (struct interface *ifp);
+extern void zebra_l2if_update_bridge_slave (struct interface *ifp,
+                                            ifindex_t bridge_ifindex);
+
+#endif /* _ZEBRA_L2_H */