ripd/rip_offset.c

   1 /* RIP 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 #include <zebra.h>
  22
  23 #include "if.h"
  24 #include "prefix.h"
  25 #include "filter.h"
  26 #include "command.h"
  27 #include "linklist.h"
  28 #include "memory.h"
  29
  30 #include "ripd/ripd.h"
  31
  32 static struct list *rip_offset_list_master;
  33
  34 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_IN].alist_name)
  35 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_IN].metric)
  36
  37 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].alist_name)
  38 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].metric)
  39
  40 struct rip_offset_list *rip_offset_list_new(const char *ifname)
  41 {
  42         struct rip_offset_list *offset;
  43
  44         offset = XCALLOC(MTYPE_RIP_OFFSET_LIST, sizeof(struct rip_offset_list));
  45         offset->ifname = strdup(ifname);
  46         listnode_add_sort(rip_offset_list_master, offset);
  47
  48         return offset;
  49 }
  50
  51 void offset_list_del(struct rip_offset_list *offset)
  52 {
  53         listnode_delete(rip_offset_list_master, offset);
  54         if (OFFSET_LIST_IN_NAME(offset))
  55                 free(OFFSET_LIST_IN_NAME(offset));
  56         if (OFFSET_LIST_OUT_NAME(offset))
  57                 free(OFFSET_LIST_OUT_NAME(offset));
  58         free(offset->ifname);
  59         XFREE(MTYPE_RIP_OFFSET_LIST, offset);
  60 }
  61
  62 struct rip_offset_list *rip_offset_list_lookup(const char *ifname)
  63 {
  64         struct rip_offset_list *offset;
  65         struct listnode *node, *nnode;
  66
  67         for (ALL_LIST_ELEMENTS(rip_offset_list_master, node, nnode, offset)) {
  68                 if (strcmp(offset->ifname, ifname) == 0)
  69                         return offset;
  70         }
  71         return NULL;
  72 }
  73
  74 /* If metric is modifed return 1. */
  75 int rip_offset_list_apply_in(struct prefix_ipv4 *p, struct interface *ifp,
  76                              uint32_t *metric)
  77 {
  78         struct rip_offset_list *offset;
  79         struct access_list *alist;
  80
  81         /* Look up offset-list with interface name. */
  82         offset = rip_offset_list_lookup(ifp->name);
  83         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  84                 alist = access_list_lookup(AFI_IP, OFFSET_LIST_IN_NAME(offset));
  85
  86                 if (alist
  87                     && access_list_apply(alist, (struct prefix *)p)
  88                                == FILTER_PERMIT) {
  89                         *metric += OFFSET_LIST_IN_METRIC(offset);
  90                         return 1;
  91                 }
  92                 return 0;
  93         }
  94         /* Look up offset-list without interface name. */
  95         offset = rip_offset_list_lookup("*");
  96         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  97                 alist = access_list_lookup(AFI_IP, 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         return 0;
 108 }
 109
 110 /* If metric is modifed return 1. */
 111 int rip_offset_list_apply_out(struct prefix_ipv4 *p, struct interface *ifp,
 112                               uint32_t *metric)
 113 {
 114         struct rip_offset_list *offset;
 115         struct access_list *alist;
 116
 117         /* Look up offset-list with interface name. */
 118         offset = rip_offset_list_lookup(ifp->name);
 119         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 120                 alist = access_list_lookup(AFI_IP,
 121                                            OFFSET_LIST_OUT_NAME(offset));
 122
 123                 if (alist
 124                     && access_list_apply(alist, (struct prefix *)p)
 125                                == FILTER_PERMIT) {
 126                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 127                         return 1;
 128                 }
 129                 return 0;
 130         }
 131
 132         /* Look up offset-list without interface name. */
 133         offset = rip_offset_list_lookup("*");
 134         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 135                 alist = access_list_lookup(AFI_IP,
 136                                            OFFSET_LIST_OUT_NAME(offset));
 137
 138                 if (alist
 139                     && access_list_apply(alist, (struct prefix *)p)
 140                                == FILTER_PERMIT) {
 141                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 142                         return 1;
 143                 }
 144                 return 0;
 145         }
 146         return 0;
 147 }
 148
 149 static int offset_list_cmp(struct rip_offset_list *o1,
 150                            struct rip_offset_list *o2)
 151 {
 152         return strcmp(o1->ifname, o2->ifname);
 153 }
 154
 155 void rip_offset_init()
 156 {
 157         rip_offset_list_master = list_new();
 158         rip_offset_list_master->cmp = (int (*)(void *, void *))offset_list_cmp;
 159         rip_offset_list_master->del = (void (*)(void *))offset_list_del;
 160 }
 161
 162 void rip_offset_clean()
 163 {
 164         list_delete(&rip_offset_list_master);
 165
 166         rip_offset_list_master = list_new();
 167         rip_offset_list_master->cmp = (int (*)(void *, void *))offset_list_cmp;
 168         rip_offset_list_master->del = (void (*)(void *))offset_list_del;
 169 }