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         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(struct ripng *ripng,
  68                                                    const char *ifname)
  69 {
  70         struct ripng_offset_list *offset;
  71         struct listnode *node, *nnode;
  72
  73         for (ALL_LIST_ELEMENTS(ripng->offset_list_master, node, nnode,
  74                                offset)) {
  75                 if (strcmp(offset->ifname, ifname) == 0)
  76                         return offset;
  77         }
  78         return NULL;
  79 }
  80
  81 /* If metric is modifed return 1. */
  82 int ripng_offset_list_apply_in(struct ripng *ripng, struct prefix_ipv6 *p,
  83                                struct interface *ifp, uint8_t *metric)
  84 {
  85         struct ripng_offset_list *offset;
  86         struct access_list *alist;
  87
  88         /* Look up offset-list with interface name. */
  89         offset = ripng_offset_list_lookup(ripng, ifp->name);
  90         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  91                 alist = access_list_lookup(AFI_IP6,
  92                                            OFFSET_LIST_IN_NAME(offset));
  93
  94                 if (alist
  95                     && access_list_apply(alist, (struct prefix *)p)
  96                                == FILTER_PERMIT) {
  97                         *metric += OFFSET_LIST_IN_METRIC(offset);
  98                         return 1;
  99                 }
 100                 return 0;
 101         }
 102         /* Look up offset-list without interface name. */
 103         offset = ripng_offset_list_lookup(ripng, "*");
 104         if (offset && OFFSET_LIST_IN_NAME(offset)) {
 105                 alist = access_list_lookup(AFI_IP6,
 106                                            OFFSET_LIST_IN_NAME(offset));
 107
 108                 if (alist
 109                     && access_list_apply(alist, (struct prefix *)p)
 110                                == FILTER_PERMIT) {
 111                         *metric += OFFSET_LIST_IN_METRIC(offset);
 112                         return 1;
 113                 }
 114                 return 0;
 115         }
 116         return 0;
 117 }
 118
 119 /* If metric is modifed return 1. */
 120 int ripng_offset_list_apply_out(struct ripng *ripng, struct prefix_ipv6 *p,
 121                                 struct interface *ifp, uint8_t *metric)
 122 {
 123         struct ripng_offset_list *offset;
 124         struct access_list *alist;
 125
 126         /* Look up offset-list with interface name. */
 127         offset = ripng_offset_list_lookup(ripng, ifp->name);
 128         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 129                 alist = access_list_lookup(AFI_IP6,
 130                                            OFFSET_LIST_OUT_NAME(offset));
 131
 132                 if (alist
 133                     && access_list_apply(alist, (struct prefix *)p)
 134                                == FILTER_PERMIT) {
 135                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 136                         return 1;
 137                 }
 138                 return 0;
 139         }
 140
 141         /* Look up offset-list without interface name. */
 142         offset = ripng_offset_list_lookup(ripng, "*");
 143         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 144                 alist = access_list_lookup(AFI_IP6,
 145                                            OFFSET_LIST_OUT_NAME(offset));
 146
 147                 if (alist
 148                     && access_list_apply(alist, (struct prefix *)p)
 149                                == FILTER_PERMIT) {
 150                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 151                         return 1;
 152                 }
 153                 return 0;
 154         }
 155         return 0;
 156 }
 157
 158 int offset_list_cmp(struct ripng_offset_list *o1, struct ripng_offset_list *o2)
 159 {
 160         return strcmp(o1->ifname, o2->ifname);
 161 }