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 static struct list *ripng_offset_list_master;
  37
  38 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].alist_name)
  39 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].metric)
  40
  41 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].alist_name)
  42 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].metric)
  43
  44 struct ripng_offset_list *ripng_offset_list_new(const char *ifname)
  45 {
  46         struct ripng_offset_list *new;
  47
  48         new = XCALLOC(MTYPE_RIPNG_OFFSET_LIST,
  49                       sizeof(struct ripng_offset_list));
  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(ripng_offset_list_master, offset);
  59         if (OFFSET_LIST_IN_NAME(offset))
  60                 free(OFFSET_LIST_IN_NAME(offset));
  61         if (OFFSET_LIST_OUT_NAME(offset))
  62                 free(OFFSET_LIST_OUT_NAME(offset));
  63         free(offset->ifname);
  64         XFREE(MTYPE_RIPNG_OFFSET_LIST, offset);
  65 }
  66
  67 struct ripng_offset_list *ripng_offset_list_lookup(const char *ifname)
  68 {
  69         struct ripng_offset_list *offset;
  70         struct listnode *node, *nnode;
  71
  72         for (ALL_LIST_ELEMENTS(ripng_offset_list_master, node, nnode, offset)) {
  73                 if (strcmp(offset->ifname, ifname) == 0)
  74                         return offset;
  75         }
  76         return NULL;
  77 }
  78
  79 /* If metric is modifed return 1. */
  80 int ripng_offset_list_apply_in(struct prefix_ipv6 *p, struct interface *ifp,
  81                                uint8_t *metric)
  82 {
  83         struct ripng_offset_list *offset;
  84         struct access_list *alist;
  85
  86         /* Look up offset-list with interface name. */
  87         offset = ripng_offset_list_lookup(ifp->name);
  88         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  89                 alist = access_list_lookup(AFI_IP6,
  90                                            OFFSET_LIST_IN_NAME(offset));
  91
  92                 if (alist
  93                     && access_list_apply(alist, (struct prefix *)p)
  94                                == FILTER_PERMIT) {
  95                         *metric += OFFSET_LIST_IN_METRIC(offset);
  96                         return 1;
  97                 }
  98                 return 0;
  99         }
 100         /* Look up offset-list without interface name. */
 101         offset = ripng_offset_list_lookup("*");
 102         if (offset && OFFSET_LIST_IN_NAME(offset)) {
 103                 alist = access_list_lookup(AFI_IP6,
 104                                            OFFSET_LIST_IN_NAME(offset));
 105
 106                 if (alist
 107                     && access_list_apply(alist, (struct prefix *)p)
 108                                == FILTER_PERMIT) {
 109                         *metric += OFFSET_LIST_IN_METRIC(offset);
 110                         return 1;
 111                 }
 112                 return 0;
 113         }
 114         return 0;
 115 }
 116
 117 /* If metric is modifed return 1. */
 118 int ripng_offset_list_apply_out(struct prefix_ipv6 *p, struct interface *ifp,
 119                                 uint8_t *metric)
 120 {
 121         struct ripng_offset_list *offset;
 122         struct access_list *alist;
 123
 124         /* Look up offset-list with interface name. */
 125         offset = ripng_offset_list_lookup(ifp->name);
 126         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 127                 alist = access_list_lookup(AFI_IP6,
 128                                            OFFSET_LIST_OUT_NAME(offset));
 129
 130                 if (alist
 131                     && access_list_apply(alist, (struct prefix *)p)
 132                                == FILTER_PERMIT) {
 133                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 134                         return 1;
 135                 }
 136                 return 0;
 137         }
 138
 139         /* Look up offset-list without interface name. */
 140         offset = ripng_offset_list_lookup("*");
 141         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 142                 alist = access_list_lookup(AFI_IP6,
 143                                            OFFSET_LIST_OUT_NAME(offset));
 144
 145                 if (alist
 146                     && access_list_apply(alist, (struct prefix *)p)
 147                                == FILTER_PERMIT) {
 148                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 149                         return 1;
 150                 }
 151                 return 0;
 152         }
 153         return 0;
 154 }
 155
 156 static int offset_list_cmp(struct ripng_offset_list *o1,
 157                            struct ripng_offset_list *o2)
 158 {
 159         return strcmp(o1->ifname, o2->ifname);
 160 }
 161
 162 void ripng_offset_init(void)
 163 {
 164         ripng_offset_list_master = list_new();
 165         ripng_offset_list_master->cmp =
 166                 (int (*)(void *, void *))offset_list_cmp;
 167         ripng_offset_list_master->del = (void (*)(void *))ripng_offset_list_del;
 168 }
 169
 170 void ripng_offset_clean(void)
 171 {
 172         list_delete(&ripng_offset_list_master);
 173
 174         ripng_offset_list_master = list_new();
 175         ripng_offset_list_master->cmp =
 176                 (int (*)(void *, void *))offset_list_cmp;
 177         ripng_offset_list_master->del = (void (*)(void *))ripng_offset_list_del;
 178 }