ripngd/ripng_route.c

   1 /*
   2  * RIPng routes function.
   3  * Copyright (C) 1998 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "prefix.h"
  26 #include "table.h"
  27 #include "memory.h"
  28 #include "if.h"
  29 #include "vty.h"
  30
  31 #include "ripngd/ripngd.h"
  32 #include "ripngd/ripng_route.h"
  33
  34 static struct ripng_aggregate *
  35 ripng_aggregate_new ()
  36 {
  37   struct ripng_aggregate *new;
  38
  39   new = XCALLOC (MTYPE_RIPNG_AGGREGATE, sizeof (struct ripng_aggregate));
  40   return new;
  41 }
  42
  43 static void
  44 ripng_aggregate_free (struct ripng_aggregate *aggregate)
  45 {
  46   XFREE (MTYPE_RIPNG_AGGREGATE, aggregate);
  47 }
  48
  49 /* Aggregate count increment check. */
  50 void
  51 ripng_aggregate_increment (struct route_node *child, struct ripng_info *rinfo)
  52 {
  53   struct route_node *np;
  54   struct ripng_aggregate *aggregate;
  55
  56   for (np = child; np; np = np->parent)
  57     if ((aggregate = np->aggregate) != NULL)
  58       {
  59         aggregate->count++;
  60         rinfo->suppress++;
  61       }
  62 }
  63
  64 /* Aggregate count decrement check. */
  65 void
  66 ripng_aggregate_decrement (struct route_node *child, struct ripng_info *rinfo)
  67 {
  68   struct route_node *np;
  69   struct ripng_aggregate *aggregate;
  70
  71   for (np = child; np; np = np->parent)
  72     if ((aggregate = np->aggregate) != NULL)
  73       {
  74         aggregate->count--;
  75         rinfo->suppress--;
  76       }
  77 }
  78
  79 /* RIPng routes treatment. */
  80 int
  81 ripng_aggregate_add (struct prefix *p)
  82 {
  83   struct route_node *top;
  84   struct route_node *rp;
  85   struct ripng_info *rinfo;
  86   struct ripng_aggregate *aggregate;
  87   struct ripng_aggregate *sub;
  88
  89   /* Get top node for aggregation. */
  90   top = route_node_get (ripng->table, p);
  91
  92   /* Allocate new aggregate. */
  93   aggregate = ripng_aggregate_new ();
  94   aggregate->metric = 1;
  95
  96   top->aggregate = aggregate;
  97
  98   /* Suppress routes match to the aggregate. */
  99   for (rp = route_lock_node (top); rp; rp = route_next_until (rp, top))
 100     {
 101       /* Suppress normal route. */
 102       if ((rinfo = rp->info) != NULL)
 103         {
 104           aggregate->count++;
 105           rinfo->suppress++;
 106         }
 107       /* Suppress aggregate route.  This may not need. */
 108       if (rp != top && (sub = rp->aggregate) != NULL)
 109         {
 110           aggregate->count++;
 111           sub->suppress++;
 112         }
 113     }
 114
 115   return 0;
 116 }
 117
 118 /* Delete RIPng static route. */
 119 int
 120 ripng_aggregate_delete (struct prefix *p)
 121 {
 122   struct route_node *top;
 123   struct route_node *rp;
 124   struct ripng_info *rinfo;
 125   struct ripng_aggregate *aggregate;
 126   struct ripng_aggregate *sub;
 127
 128   /* Get top node for aggregation. */
 129   top = route_node_get (ripng->table, p);
 130
 131   /* Allocate new aggregate. */
 132   aggregate = top->aggregate;
 133
 134   /* Suppress routes match to the aggregate. */
 135   for (rp = route_lock_node (top); rp; rp = route_next_until (rp, top))
 136     {
 137       /* Suppress normal route. */
 138       if ((rinfo = rp->info) != NULL)
 139         {
 140           aggregate->count--;
 141           rinfo->suppress--;
 142         }
 143
 144       if (rp != top && (sub = rp->aggregate) != NULL)
 145         {
 146           aggregate->count--;
 147           sub->suppress--;
 148         }
 149     }
 150
 151   top->aggregate = NULL;
 152   ripng_aggregate_free (aggregate);
 153
 154   route_unlock_node (top);
 155   route_unlock_node (top);
 156
 157   return 0;
 158 }