ripd/rip_offset.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* RIP offset-list
   3  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
   4  */
   5
   6 #include <zebra.h>
   7
   8 #include "if.h"
   9 #include "prefix.h"
  10 #include "filter.h"
  11 #include "command.h"
  12 #include "linklist.h"
  13 #include "memory.h"
  14
  15 #include "ripd/ripd.h"
  16
  17 DEFINE_MTYPE_STATIC(RIPD, RIP_OFFSET_LIST, "RIP offset list");
  18
  19 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_IN].alist_name)
  20 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_IN].metric)
  21
  22 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].alist_name)
  23 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIP_OFFSET_LIST_OUT].metric)
  24
  25 struct rip_offset_list *rip_offset_list_new(struct rip *rip, const char *ifname)
  26 {
  27         struct rip_offset_list *offset;
  28
  29         offset = XCALLOC(MTYPE_RIP_OFFSET_LIST, sizeof(struct rip_offset_list));
  30         offset->rip = rip;
  31         offset->ifname = strdup(ifname);
  32         listnode_add_sort(rip->offset_list_master, offset);
  33
  34         return offset;
  35 }
  36
  37 void offset_list_del(struct rip_offset_list *offset)
  38 {
  39         listnode_delete(offset->rip->offset_list_master, offset);
  40         offset_list_free(offset);
  41 }
  42
  43 void offset_list_free(struct rip_offset_list *offset)
  44 {
  45         if (OFFSET_LIST_IN_NAME(offset))
  46                 free(OFFSET_LIST_IN_NAME(offset));
  47         if (OFFSET_LIST_OUT_NAME(offset))
  48                 free(OFFSET_LIST_OUT_NAME(offset));
  49         free(offset->ifname);
  50         XFREE(MTYPE_RIP_OFFSET_LIST, offset);
  51 }
  52
  53 struct rip_offset_list *rip_offset_list_lookup(struct rip *rip,
  54                                                const char *ifname)
  55 {
  56         struct rip_offset_list *offset;
  57         struct listnode *node, *nnode;
  58
  59         for (ALL_LIST_ELEMENTS(rip->offset_list_master, node, nnode, offset)) {
  60                 if (strcmp(offset->ifname, ifname) == 0)
  61                         return offset;
  62         }
  63         return NULL;
  64 }
  65
  66 /* If metric is modified return 1. */
  67 int rip_offset_list_apply_in(struct prefix_ipv4 *p, struct interface *ifp,
  68                              uint32_t *metric)
  69 {
  70         struct rip_interface *ri = ifp->info;
  71         struct rip_offset_list *offset;
  72         struct access_list *alist;
  73
  74         /* Look up offset-list with interface name. */
  75         offset = rip_offset_list_lookup(ri->rip, ifp->name);
  76         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  77                 alist = access_list_lookup(AFI_IP, OFFSET_LIST_IN_NAME(offset));
  78
  79                 if (alist
  80                     && access_list_apply(alist, (struct prefix *)p)
  81                                == FILTER_PERMIT) {
  82                         *metric += OFFSET_LIST_IN_METRIC(offset);
  83                         return 1;
  84                 }
  85                 return 0;
  86         }
  87         /* Look up offset-list without interface name. */
  88         offset = rip_offset_list_lookup(ri->rip, "*");
  89         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  90                 alist = access_list_lookup(AFI_IP, 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         return 0;
 101 }
 102
 103 /* If metric is modified return 1. */
 104 int rip_offset_list_apply_out(struct prefix_ipv4 *p, struct interface *ifp,
 105                               uint32_t *metric)
 106 {
 107         struct rip_interface *ri = ifp->info;
 108         struct rip_offset_list *offset;
 109         struct access_list *alist;
 110
 111         /* Look up offset-list with interface name. */
 112         offset = rip_offset_list_lookup(ri->rip, ifp->name);
 113         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 114                 alist = access_list_lookup(AFI_IP,
 115                                            OFFSET_LIST_OUT_NAME(offset));
 116
 117                 if (alist
 118                     && access_list_apply(alist, (struct prefix *)p)
 119                                == FILTER_PERMIT) {
 120                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 121                         return 1;
 122                 }
 123                 return 0;
 124         }
 125
 126         /* Look up offset-list without interface name. */
 127         offset = rip_offset_list_lookup(ri->rip, "*");
 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         return 0;
 141 }
 142
 143 int offset_list_cmp(struct rip_offset_list *o1, struct rip_offset_list *o2)
 144 {
 145         return strcmp(o1->ifname, o2->ifname);
 146 }