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 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_IN].alist_name)
  33 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_IN].metric)
  34
  35 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].alist_name)
  36 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].metric)
  37
  38 struct rip_offset_list *rip_offset_list_new(struct rip *rip, const char *ifname)
  39 {
  40         struct rip_offset_list *offset;
  41
  42         offset = XCALLOC(MTYPE_RIP_OFFSET_LIST, sizeof(struct rip_offset_list));
  43         offset->rip = rip;
  44         offset->ifname = strdup(ifname);
  45         listnode_add_sort(rip->offset_list_master, offset);
  46
  47         return offset;
  48 }
  49
  50 void offset_list_del(struct rip_offset_list *offset)
  51 {
  52         listnode_delete(offset->rip->offset_list_master, offset);
  53         if (OFFSET_LIST_IN_NAME(offset))
  54                 free(OFFSET_LIST_IN_NAME(offset));
  55         if (OFFSET_LIST_OUT_NAME(offset))
  56                 free(OFFSET_LIST_OUT_NAME(offset));
  57         free(offset->ifname);
  58         XFREE(MTYPE_RIP_OFFSET_LIST, offset);
  59 }
  60
  61 struct rip_offset_list *rip_offset_list_lookup(struct rip *rip,
  62                                                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_interface *ri = ifp->info;
  79         struct rip_offset_list *offset;
  80         struct access_list *alist;
  81
  82         /* Look up offset-list with interface name. */
  83         offset = rip_offset_list_lookup(ri->rip, ifp->name);
  84         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  85                 alist = access_list_lookup(AFI_IP, OFFSET_LIST_IN_NAME(offset));
  86
  87                 if (alist
  88                     && access_list_apply(alist, (struct prefix *)p)
  89                                == FILTER_PERMIT) {
  90                         *metric += OFFSET_LIST_IN_METRIC(offset);
  91                         return 1;
  92                 }
  93                 return 0;
  94         }
  95         /* Look up offset-list without interface name. */
  96         offset = rip_offset_list_lookup(ri->rip, "*");
  97         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  98                 alist = access_list_lookup(AFI_IP, OFFSET_LIST_IN_NAME(offset));
  99
 100                 if (alist
 101                     && access_list_apply(alist, (struct prefix *)p)
 102                                == FILTER_PERMIT) {
 103                         *metric += OFFSET_LIST_IN_METRIC(offset);
 104                         return 1;
 105                 }
 106                 return 0;
 107         }
 108         return 0;
 109 }
 110
 111 /* If metric is modifed return 1. */
 112 int rip_offset_list_apply_out(struct prefix_ipv4 *p, struct interface *ifp,
 113                               uint32_t *metric)
 114 {
 115         struct rip_interface *ri = ifp->info;
 116         struct rip_offset_list *offset;
 117         struct access_list *alist;
 118
 119         /* Look up offset-list with interface name. */
 120         offset = rip_offset_list_lookup(ri->rip, ifp->name);
 121         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 122                 alist = access_list_lookup(AFI_IP,
 123                                            OFFSET_LIST_OUT_NAME(offset));
 124
 125                 if (alist
 126                     && access_list_apply(alist, (struct prefix *)p)
 127                                == FILTER_PERMIT) {
 128                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 129                         return 1;
 130                 }
 131                 return 0;
 132         }
 133
 134         /* Look up offset-list without interface name. */
 135         offset = rip_offset_list_lookup(ri->rip, "*");
 136         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 137                 alist = access_list_lookup(AFI_IP,
 138                                            OFFSET_LIST_OUT_NAME(offset));
 139
 140                 if (alist
 141                     && access_list_apply(alist, (struct prefix *)p)
 142                                == FILTER_PERMIT) {
 143                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 144                         return 1;
 145                 }
 146                 return 0;
 147         }
 148         return 0;
 149 }
 150
 151 int offset_list_cmp(struct rip_offset_list *o1, struct rip_offset_list *o2)
 152 {
 153         return strcmp(o1->ifname, o2->ifname);
 154 }