lib, zebra: move "struct vrf" to be a lib module

Previously "struct vrf" is defined locally in zebra. Now it is moved
to be a lib module.

This is the first step to support multi-VRF in quagga. The
implementation is splitted into small patches for the purpose of
easy review.

* lib:
    "struct vrf" with basic members is defined in vrf.c. The member
    "void *info" is for user data.

    Some basic functions are defined in vrf.c for adding/deleting/
    looking up a VRF, scanning the VRF table and initializing the
    VRF module.

    The type "vrf_id_t" is defined specificly for VRF ID.

* zebra:
    The previous "struct vrf" is re-defined as "struct zebra_vrf";
    and previous "vrf" variables are renamed to "zvrf".

    The previous "struct vrf" related functions are removed from
    zbera_rib.c. New functions are defined to maintain the new
    "struct zebra_vrf".

    The names vrf_xxx are reserved for the functions in VRF module.
    So:
    - the previous vrf_table() are renamed to zebra_vrf_table();
    - the previous vrf_static_table() are renamed to
      zebra_vrf_static_table().

    The main logic is not changed.

    BTW: Add a statement to zebra_snmp.c telling that the SNMP is
         running only for the MIBs in the default VRF.

Signed-off-by: Feng Lu <lu.feng@6wind.com>
Reviewed-by: Alain Ritoux <alain.ritoux@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Vincent JARDIN <vincent.jardin@6wind.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

1 files changed, 26 insertions, 1 deletions

diff --git a/zebra/main.c b/zebra/main.c
index d7f2a108..a690c9a1 100644
--- a/zebra/main.c
+++ b/zebra/main.c
@@ -32,6 +32,7 @@
 #include "plist.h"
 #include "privs.h"
 #include "sigevent.h"
+#include "vrf.h"
 
 #include "zebra/rib.h"
 #include "zebra/zserv.h"
@@ -204,6 +205,29 @@ struct quagga_signal_t zebra_signals[] =
   },
 };
 
+/* Callback upon creating a new VRF. */
+static int
+zebra_vrf_new (vrf_id_t vrf_id, void **info)
+{
+  struct zebra_vrf *zvrf = *info;
+
+  if (! zvrf)
+    {
+      zvrf = zebra_vrf_alloc (vrf_id);
+      *info = (void *)zvrf;
+    }
+
+  return 0;
+}
+
+/* Zebra VRF initialization. */
+static void
+zebra_vrf_init (void)
+{
+  vrf_add_hook (VRF_NEW_HOOK, zebra_vrf_new);
+  vrf_init ();
+}
+
 /* Main startup routine. */
 int
 main (int argc, char **argv)
@@ -338,7 +362,8 @@ main (int argc, char **argv)
   /* For debug purpose. */
   /* SET_FLAG (zebra_debug_event, ZEBRA_DEBUG_EVENT); */
 
-  /* Make kernel routing socket. */
+  /* Initialize VRF module, and make kernel routing socket. */
+  zebra_vrf_init ();
   kernel_init ();
   interface_list ();
   route_read ();