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-rw-r--r--lib/vrf.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/lib/vrf.c b/lib/vrf.c
new file mode 100644
index 00000000..3ccbb996
--- /dev/null
+++ b/lib/vrf.c
@@ -0,0 +1,268 @@
+/*
+ * VRF functions.
+ * Copyright (C) 2014 6WIND S.A.
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra 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.
+ *
+ * GNU Zebra 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 GNU Zebra; see the file COPYING. If not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <zebra.h>
+
+#include "vrf.h"
+#include "prefix.h"
+#include "table.h"
+#include "log.h"
+#include "memory.h"
+
+struct vrf
+{
+ /* Identifier, same as the vector index */
+ vrf_id_t vrf_id;
+ /* Name */
+ char *name;
+
+ /* User data */
+ void *info;
+};
+
+/* Holding VRF hooks */
+struct vrf_master
+{
+ int (*vrf_new_hook) (vrf_id_t, void **);
+ int (*vrf_delete_hook) (vrf_id_t, void **);
+} vrf_master = {0,};
+
+/* VRF table */
+struct route_table *vrf_table = NULL;
+
+/* Build the table key */
+static void
+vrf_build_key (vrf_id_t vrf_id, struct prefix *p)
+{
+ p->family = AF_INET;
+ p->prefixlen = IPV4_MAX_BITLEN;
+ p->u.prefix4.s_addr = vrf_id;
+}
+
+/* Get a VRF. If not found, create one. */
+static struct vrf *
+vrf_get (vrf_id_t vrf_id)
+{
+ struct prefix p;
+ struct route_node *rn;
+ struct vrf *vrf;
+
+ vrf_build_key (vrf_id, &p);
+ rn = route_node_get (vrf_table, &p);
+ if (rn->info)
+ {
+ vrf = (struct vrf *)rn->info;
+ route_unlock_node (rn); /* get */
+ return vrf;
+ }
+
+ vrf = XCALLOC (MTYPE_VRF, sizeof (struct vrf));
+ vrf->vrf_id = vrf_id;
+ rn->info = vrf;
+
+ zlog_info ("VRF %u is created.", vrf_id);
+
+ if (vrf_master.vrf_new_hook)
+ (*vrf_master.vrf_new_hook) (vrf_id, &vrf->info);
+
+ return vrf;
+}
+
+/* Delete a VRF. This is called in vrf_terminate(). */
+static void
+vrf_delete (struct vrf *vrf)
+{
+ zlog_info ("VRF %u is to be deleted.", vrf->vrf_id);
+
+ if (vrf_master.vrf_delete_hook)
+ (*vrf_master.vrf_delete_hook) (vrf->vrf_id, &vrf->info);
+
+ if (vrf->name)
+ XFREE (MTYPE_VRF_NAME, vrf->name);
+
+ XFREE (MTYPE_VRF, vrf);
+}
+
+/* Look up a VRF by identifier. */
+static struct vrf *
+vrf_lookup (vrf_id_t vrf_id)
+{
+ struct prefix p;
+ struct route_node *rn;
+ struct vrf *vrf = NULL;
+
+ vrf_build_key (vrf_id, &p);
+ rn = route_node_lookup (vrf_table, &p);
+ if (rn)
+ {
+ vrf = (struct vrf *)rn->info;
+ route_unlock_node (rn); /* lookup */
+ }
+ return vrf;
+}
+
+/* Add a VRF hook. Please add hooks before calling vrf_init(). */
+void
+vrf_add_hook (int type, int (*func)(vrf_id_t, void **))
+{
+ switch (type) {
+ case VRF_NEW_HOOK:
+ vrf_master.vrf_new_hook = func;
+ break;
+ case VRF_DELETE_HOOK:
+ vrf_master.vrf_delete_hook = func;
+ break;
+ default:
+ break;
+ }
+}
+
+/* Return the iterator of the first VRF. */
+vrf_iter_t
+vrf_first (void)
+{
+ struct route_node *rn;
+
+ for (rn = route_top (vrf_table); rn; rn = route_next (rn))
+ if (rn->info)
+ {
+ route_unlock_node (rn); /* top/next */
+ return (vrf_iter_t)rn;
+ }
+ return VRF_ITER_INVALID;
+}
+
+/* Return the next VRF iterator to the given iterator. */
+vrf_iter_t
+vrf_next (vrf_iter_t iter)
+{
+ struct route_node *rn = NULL;
+
+ /* Lock it first because route_next() will unlock it. */
+ if (iter != VRF_ITER_INVALID)
+ rn = route_next (route_lock_node ((struct route_node *)iter));
+
+ for (; rn; rn = route_next (rn))
+ if (rn->info)
+ {
+ route_unlock_node (rn); /* next */
+ return (vrf_iter_t)rn;
+ }
+ return VRF_ITER_INVALID;
+}
+
+/* Return the VRF iterator of the given VRF ID. If it does not exist,
+ * the iterator of the next existing VRF is returned. */
+vrf_iter_t
+vrf_iterator (vrf_id_t vrf_id)
+{
+ struct prefix p;
+ struct route_node *rn;
+
+ vrf_build_key (vrf_id, &p);
+ rn = route_node_get (vrf_table, &p);
+ if (rn->info)
+ {
+ /* OK, the VRF exists. */
+ route_unlock_node (rn); /* get */
+ return (vrf_iter_t)rn;
+ }
+
+ /* Find the next VRF. */
+ for (rn = route_next (rn); rn; rn = route_next (rn))
+ if (rn->info)
+ {
+ route_unlock_node (rn); /* next */
+ return (vrf_iter_t)rn;
+ }
+
+ return VRF_ITER_INVALID;
+}
+
+/* Obtain the VRF ID from the given VRF iterator. */
+vrf_id_t
+vrf_iter2id (vrf_iter_t iter)
+{
+ struct route_node *rn = (struct route_node *) iter;
+ return (rn && rn->info) ? ((struct vrf *)rn->info)->vrf_id : VRF_DEFAULT;
+}
+
+/* Obtain the data pointer from the given VRF iterator. */
+void *
+vrf_iter2info (vrf_iter_t iter)
+{
+ struct route_node *rn = (struct route_node *) iter;
+ return (rn && rn->info) ? ((struct vrf *)rn->info)->info : NULL;
+}
+
+/* Get the data pointer of the specified VRF. If not found, create one. */
+void *
+vrf_info_get (vrf_id_t vrf_id)
+{
+ struct vrf *vrf = vrf_get (vrf_id);
+ return vrf->info;
+}
+
+/* Look up the data pointer of the specified VRF. */
+void *
+vrf_info_lookup (vrf_id_t vrf_id)
+{
+ struct vrf *vrf = vrf_lookup (vrf_id);
+ return vrf ? vrf->info : NULL;
+}
+
+/* Initialize VRF module. */
+void
+vrf_init (void)
+{
+ struct vrf *default_vrf;
+
+ /* Allocate VRF table. */
+ vrf_table = route_table_init ();
+
+ /* The default VRF always exists. */
+ default_vrf = vrf_get (VRF_DEFAULT);
+ if (!default_vrf)
+ {
+ zlog_err ("vrf_init: failed to create the default VRF!");
+ exit (1);
+ }
+
+ /* Set the default VRF name. */
+ default_vrf->name = XSTRDUP (MTYPE_VRF_NAME, "Default-IP-Routing-Table");
+}
+
+/* Terminate VRF module. */
+void
+vrf_terminate (void)
+{
+ struct route_node *rn;
+ struct vrf *vrf;
+
+ for (rn = route_top (vrf_table); rn; rn = route_next (rn))
+ if ((vrf = rn->info) != NULL)
+ vrf_delete (vrf);
+
+ route_table_finish (vrf_table);
+ vrf_table = NULL;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-22 23:49:43 +0000