bgpd/bgp_table.c

   1 /* BGP routing table
   2  * Copyright (C) 1998, 2001 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <zebra.h>
  22
  23 #include "prefix.h"
  24 #include "memory.h"
  25 #include "sockunion.h"
  26 #include "queue.h"
  27 #include "filter.h"
  28 #include "command.h"
  29
  30 #include "bgpd/bgpd.h"
  31 #include "bgpd/bgp_table.h"
  32
  33 void bgp_table_lock(struct bgp_table *rt)
  34 {
  35         rt->lock++;
  36 }
  37
  38 void bgp_table_unlock(struct bgp_table *rt)
  39 {
  40         assert(rt->lock > 0);
  41         rt->lock--;
  42
  43         if (rt->lock != 0) {
  44                 return;
  45         }
  46
  47         route_table_finish(rt->route_table);
  48         rt->route_table = NULL;
  49
  50         XFREE(MTYPE_BGP_TABLE, rt);
  51 }
  52
  53 void bgp_table_finish(struct bgp_table **rt)
  54 {
  55         if (*rt != NULL) {
  56                 bgp_table_unlock(*rt);
  57                 *rt = NULL;
  58         }
  59 }
  60
  61 /*
  62  * bgp_node_create
  63  */
  64 static struct route_node *bgp_node_create(route_table_delegate_t *delegate,
  65                                           struct route_table *table)
  66 {
  67         struct bgp_node *node;
  68         node = XCALLOC(MTYPE_BGP_NODE, sizeof(struct bgp_node));
  69         return bgp_node_to_rnode(node);
  70 }
  71
  72 /*
  73  * bgp_node_destroy
  74  */
  75 static void bgp_node_destroy(route_table_delegate_t *delegate,
  76                              struct route_table *table, struct route_node *node)
  77 {
  78         struct bgp_node *bgp_node;
  79         bgp_node = bgp_node_from_rnode(node);
  80         XFREE(MTYPE_BGP_NODE, bgp_node);
  81 }
  82
  83 /*
  84  * Function vector to customize the behavior of the route table
  85  * library for BGP route tables.
  86  */
  87 route_table_delegate_t bgp_table_delegate = {.create_node = bgp_node_create,
  88                                              .destroy_node = bgp_node_destroy};
  89
  90 /*
  91  * bgp_table_init
  92  */
  93 struct bgp_table *bgp_table_init(struct bgp *bgp, afi_t afi, safi_t safi)
  94 {
  95         struct bgp_table *rt;
  96
  97         rt = XCALLOC(MTYPE_BGP_TABLE, sizeof(struct bgp_table));
  98
  99         rt->route_table = route_table_init_with_delegate(&bgp_table_delegate);
 100
 101         /*
 102          * Set up back pointer to bgp_table.
 103          */
 104         rt->route_table->info = rt;
 105
 106         /*
 107          * pointer to bgp instance allows working back from bgp_info to bgp
 108          */
 109         rt->bgp = bgp;
 110
 111         bgp_table_lock(rt);
 112         rt->afi = afi;
 113         rt->safi = safi;
 114
 115         return rt;
 116 }