ripngd/ripng_offset.c

   1 /* RIPng offset-list
   2  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
   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 /* RIPng support by Vincent Jardin <vincent.jardin@6wind.com>
  22  * Copyright (C) 2002 6WIND
  23  */
  24
  25 #include <zebra.h>
  26
  27 #include "if.h"
  28 #include "prefix.h"
  29 #include "filter.h"
  30 #include "command.h"
  31 #include "linklist.h"
  32 #include "memory.h"
  33
  34 #include "ripngd/ripngd.h"
  35
  36 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].alist_name)
  37 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].metric)
  38
  39 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].alist_name)
  40 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].metric)
  41
  42 struct ripng_offset_list *ripng_offset_list_new(struct ripng *ripng,
  43                                                 const char *ifname)
  44 {
  45         struct ripng_offset_list *new;
  46
  47         new = XCALLOC(MTYPE_RIPNG_OFFSET_LIST,
  48                       sizeof(struct ripng_offset_list));
  49         new->ripng = ripng;
  50         new->ifname = strdup(ifname);
  51         listnode_add_sort(ripng->offset_list_master, new);
  52
  53         return new;
  54 }
  55
  56 void ripng_offset_list_del(struct ripng_offset_list *offset)
  57 {
  58         listnode_delete(offset->ripng->offset_list_master, offset);
  59         ripng_offset_list_free(offset);
  60 }
  61
  62 void ripng_offset_list_free(struct ripng_offset_list *offset)
  63 {
  64         if (OFFSET_LIST_IN_NAME(offset))
  65                 free(OFFSET_LIST_IN_NAME(offset));
  66         if (OFFSET_LIST_OUT_NAME(offset))
  67                 free(OFFSET_LIST_OUT_NAME(offset));
  68         free(offset->ifname);
  69         XFREE(MTYPE_RIPNG_OFFSET_LIST, offset);
  70 }
  71
  72 struct ripng_offset_list *ripng_offset_list_lookup(struct ripng *ripng,
  73                                                    const char *ifname)
  74 {
  75         struct ripng_offset_list *offset;
  76         struct listnode *node, *nnode;
  77
  78         for (ALL_LIST_ELEMENTS(ripng->offset_list_master, node, nnode,
  79                                offset)) {
  80                 if (strcmp(offset->ifname, ifname) == 0)
  81                         return offset;
  82         }
  83         return NULL;
  84 }
  85
  86 /* If metric is modifed return 1. */
  87 int ripng_offset_list_apply_in(struct ripng *ripng, struct prefix_ipv6 *p,
  88                                struct interface *ifp, uint8_t *metric)
  89 {
  90         struct ripng_offset_list *offset;
  91         struct access_list *alist;
  92
  93         /* Look up offset-list with interface name. */
  94         offset = ripng_offset_list_lookup(ripng, ifp->name);
  95         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  96                 alist = access_list_lookup(AFI_IP6,
  97                                            OFFSET_LIST_IN_NAME(offset));
  98
  99                 if (alist
 100                     && access_list_apply(alist, (struct prefix *)p)
 101                                == FILTER_PERMIT) {
 102                         *metric += OFFSET_LIST_IN_METRIC(offset);
 103                         return 1;
 104                 }
 105                 return 0;
 106         }
 107         /* Look up offset-list without interface name. */
 108         offset = ripng_offset_list_lookup(ripng, "*");
 109         if (offset && OFFSET_LIST_IN_NAME(offset)) {
 110                 alist = access_list_lookup(AFI_IP6,
 111                                            OFFSET_LIST_IN_NAME(offset));
 112
 113                 if (alist
 114                     && access_list_apply(alist, (struct prefix *)p)
 115                                == FILTER_PERMIT) {
 116                         *metric += OFFSET_LIST_IN_METRIC(offset);
 117                         return 1;
 118                 }
 119                 return 0;
 120         }
 121         return 0;
 122 }
 123
 124 /* If metric is modifed return 1. */
 125 int ripng_offset_list_apply_out(struct ripng *ripng, struct prefix_ipv6 *p,
 126                                 struct interface *ifp, uint8_t *metric)
 127 {
 128         struct ripng_offset_list *offset;
 129         struct access_list *alist;
 130
 131         /* Look up offset-list with interface name. */
 132         offset = ripng_offset_list_lookup(ripng, ifp->name);
 133         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 134                 alist = access_list_lookup(AFI_IP6,
 135                                            OFFSET_LIST_OUT_NAME(offset));
 136
 137                 if (alist
 138                     && access_list_apply(alist, (struct prefix *)p)
 139                                == FILTER_PERMIT) {
 140                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 141                         return 1;
 142                 }
 143                 return 0;
 144         }
 145
 146         /* Look up offset-list without interface name. */
 147         offset = ripng_offset_list_lookup(ripng, "*");
 148         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 149                 alist = access_list_lookup(AFI_IP6,
 150                                            OFFSET_LIST_OUT_NAME(offset));
 151
 152                 if (alist
 153                     && access_list_apply(alist, (struct prefix *)p)
 154                                == FILTER_PERMIT) {
 155                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 156                         return 1;
 157                 }
 158                 return 0;
 159         }
 160         return 0;
 161 }
 162
 163 int offset_list_cmp(struct ripng_offset_list *o1, struct ripng_offset_list *o2)
 164 {
 165         return strcmp(o1->ifname, o2->ifname);
 166 }