ripngd/ripng_offset.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* RIPng offset-list
   3  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
   4  */
   5
   6 /* RIPng support by Vincent Jardin <vincent.jardin@6wind.com>
   7  * Copyright (C) 2002 6WIND
   8  */
   9
  10 #include <zebra.h>
  11
  12 #include "if.h"
  13 #include "prefix.h"
  14 #include "filter.h"
  15 #include "command.h"
  16 #include "linklist.h"
  17 #include "memory.h"
  18
  19 #include "ripngd/ripngd.h"
  20
  21 DEFINE_MTYPE_STATIC(RIPNGD, RIPNG_OFFSET_LIST, "RIPng offset lst");
  22
  23 #define OFFSET_LIST_IN_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].alist_name)
  24 #define OFFSET_LIST_IN_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_IN].metric)
  25
  26 #define OFFSET_LIST_OUT_NAME(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].alist_name)
  27 #define OFFSET_LIST_OUT_METRIC(O)  ((O)->direct[RIPNG_OFFSET_LIST_OUT].metric)
  28
  29 struct ripng_offset_list *ripng_offset_list_new(struct ripng *ripng,
  30                                                 const char *ifname)
  31 {
  32         struct ripng_offset_list *new;
  33
  34         new = XCALLOC(MTYPE_RIPNG_OFFSET_LIST,
  35                       sizeof(struct ripng_offset_list));
  36         new->ripng = ripng;
  37         new->ifname = strdup(ifname);
  38         listnode_add_sort(ripng->offset_list_master, new);
  39
  40         return new;
  41 }
  42
  43 void ripng_offset_list_del(struct ripng_offset_list *offset)
  44 {
  45         listnode_delete(offset->ripng->offset_list_master, offset);
  46         ripng_offset_list_free(offset);
  47 }
  48
  49 void ripng_offset_list_free(struct ripng_offset_list *offset)
  50 {
  51         if (OFFSET_LIST_IN_NAME(offset))
  52                 free(OFFSET_LIST_IN_NAME(offset));
  53         if (OFFSET_LIST_OUT_NAME(offset))
  54                 free(OFFSET_LIST_OUT_NAME(offset));
  55         free(offset->ifname);
  56         XFREE(MTYPE_RIPNG_OFFSET_LIST, offset);
  57 }
  58
  59 struct ripng_offset_list *ripng_offset_list_lookup(struct ripng *ripng,
  60                                                    const char *ifname)
  61 {
  62         struct ripng_offset_list *offset;
  63         struct listnode *node, *nnode;
  64
  65         for (ALL_LIST_ELEMENTS(ripng->offset_list_master, node, nnode,
  66                                offset)) {
  67                 if (strcmp(offset->ifname, ifname) == 0)
  68                         return offset;
  69         }
  70         return NULL;
  71 }
  72
  73 /* If metric is modified return 1. */
  74 int ripng_offset_list_apply_in(struct ripng *ripng, struct prefix_ipv6 *p,
  75                                struct interface *ifp, uint8_t *metric)
  76 {
  77         struct ripng_offset_list *offset;
  78         struct access_list *alist;
  79
  80         /* Look up offset-list with interface name. */
  81         offset = ripng_offset_list_lookup(ripng, ifp->name);
  82         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  83                 alist = access_list_lookup(AFI_IP6,
  84                                            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 = ripng_offset_list_lookup(ripng, "*");
  96         if (offset && OFFSET_LIST_IN_NAME(offset)) {
  97                 alist = access_list_lookup(AFI_IP6,
  98                                            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 modified return 1. */
 112 int ripng_offset_list_apply_out(struct ripng *ripng, struct prefix_ipv6 *p,
 113                                 struct interface *ifp, uint8_t *metric)
 114 {
 115         struct ripng_offset_list *offset;
 116         struct access_list *alist;
 117
 118         /* Look up offset-list with interface name. */
 119         offset = ripng_offset_list_lookup(ripng, ifp->name);
 120         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 121                 alist = access_list_lookup(AFI_IP6,
 122                                            OFFSET_LIST_OUT_NAME(offset));
 123
 124                 if (alist
 125                     && access_list_apply(alist, (struct prefix *)p)
 126                                == FILTER_PERMIT) {
 127                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 128                         return 1;
 129                 }
 130                 return 0;
 131         }
 132
 133         /* Look up offset-list without interface name. */
 134         offset = ripng_offset_list_lookup(ripng, "*");
 135         if (offset && OFFSET_LIST_OUT_NAME(offset)) {
 136                 alist = access_list_lookup(AFI_IP6,
 137                                            OFFSET_LIST_OUT_NAME(offset));
 138
 139                 if (alist
 140                     && access_list_apply(alist, (struct prefix *)p)
 141                                == FILTER_PERMIT) {
 142                         *metric += OFFSET_LIST_OUT_METRIC(offset);
 143                         return 1;
 144                 }
 145                 return 0;
 146         }
 147         return 0;
 148 }
 149
 150 int offset_list_cmp(struct ripng_offset_list *o1, struct ripng_offset_list *o2)
 151 {
 152         return strcmp(o1->ifname, o2->ifname);
 153 }