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_MTYPE_STATIC(RIPD, RIP_OFFSET_LIST, "RIP offset list")
  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(struct rip *rip, 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->rip = rip;
  46         offset->ifname = strdup(ifname);
  47         listnode_add_sort(rip->offset_list_master, offset);
  48
  49         return offset;
  50 }
  51
  52 void offset_list_del(struct rip_offset_list *offset)
  53 {
  54         listnode_delete(offset->rip->offset_list_master, offset);
  55         offset_list_free(offset);
  56 }
  57
  58 void offset_list_free(struct rip_offset_list *offset)
  59 {
  60         if (OFFSET_LIST_IN_NAME(offset))
  61                 free(OFFSET_LIST_IN_NAME(offset));
  62         if (OFFSET_LIST_OUT_NAME(offset))
  63                 free(OFFSET_LIST_OUT_NAME(offset));
  64         free(offset->ifname);
  65         XFREE(MTYPE_RIP_OFFSET_LIST, offset);
  66 }
  67
  68 struct rip_offset_list *rip_offset_list_lookup(struct rip *rip,
  69                                                const char *ifname)
  70 {
  71         struct rip_offset_list *offset;
  72         struct listnode *node, *nnode;
  73
  74         for (ALL_LIST_ELEMENTS(rip->offset_list_master, node, nnode, 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 rip_offset_list_apply_in(struct prefix_ipv4 *p, struct interface *ifp,
  83                              uint32_t *metric)
  84 {
  85         struct rip_interface *ri = ifp->info;
  86         struct rip_offset_list *offset;
  87         struct access_list *alist;
  88
  89         /* Look up offset-list with interface name. */
  90         offset = rip_offset_list_lookup(ri->rip, ifp->name);
  91         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  92                 alist = access_list_lookup(AFI_IP, 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 = rip_offset_list_lookup(ri->rip, "*");
 104         if (offset && OFFSET_LIST_IN_NAME(offset)) {
 105                 alist = access_list_lookup(AFI_IP, OFFSET_LIST_IN_NAME(offset));
 106
 107                 if (alist
 108                     && access_list_apply(alist, (struct prefix *)p)
 109                                == FILTER_PERMIT) {
 110                         *metric += OFFSET_LIST_IN_METRIC(offset);
 111                         return 1;
 112                 }
 113                 return 0;
 114         }
 115         return 0;
 116 }
 117
 118 /* If metric is modifed return 1. */
 119 int rip_offset_list_apply_out(struct prefix_ipv4 *p, struct interface *ifp,
 120                               uint32_t *metric)
 121 {
 122         struct rip_interface *ri = ifp->info;
 123         struct rip_offset_list *offset;
 124         struct access_list *alist;
 125
 126         /* Look up offset-list with interface name. */
 127         offset = rip_offset_list_lookup(ri->rip, ifp->name);
 128         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 129                 alist = access_list_lookup(AFI_IP,
 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 = rip_offset_list_lookup(ri->rip, "*");
 143         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 144                 alist = access_list_lookup(AFI_IP,
 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 rip_offset_list *o1, struct rip_offset_list *o2)
 159 {
 160         return strcmp(o1->ifname, o2->ifname);
 161 }