ripngd/ripng_routemap.c

   1 /* RIPng routemap.
   2  * Copyright (C) 1999 Kunihiro Ishiguro
   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 "memory.h"
  25 #include "prefix.h"
  26 #include "vty.h"
  27 #include "routemap.h"
  28 #include "command.h"
  29 #include "sockunion.h"
  30
  31 #include "ripngd/ripngd.h"
  32
  33 struct rip_metric_modifier {
  34         enum { metric_increment, metric_decrement, metric_absolute } type;
  35         bool used;
  36         uint8_t metric;
  37 };
  38
  39 /* `match metric METRIC' */
  40 /* Match function return 1 if match is success else return zero. */
  41 static enum route_map_cmd_result_t
  42 route_match_metric(void *rule, const struct prefix *prefix, void *object)
  43 {
  44         uint32_t *metric;
  45         struct ripng_info *rinfo;
  46
  47         metric = rule;
  48         rinfo = object;
  49
  50         if (rinfo->metric == *metric)
  51                 return RMAP_MATCH;
  52         else
  53                 return RMAP_NOMATCH;
  54
  55         return RMAP_NOMATCH;
  56 }
  57
  58 /* Route map `match metric' match statement. `arg' is METRIC value */
  59 static void *route_match_metric_compile(const char *arg)
  60 {
  61         uint32_t *metric;
  62
  63         metric = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(uint32_t));
  64         *metric = atoi(arg);
  65
  66         if (*metric > 0)
  67                 return metric;
  68
  69         XFREE(MTYPE_ROUTE_MAP_COMPILED, metric);
  70         return NULL;
  71 }
  72
  73 /* Free route map's compiled `match metric' value. */
  74 static void route_match_metric_free(void *rule)
  75 {
  76         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
  77 }
  78
  79 /* Route map commands for metric matching. */
  80 static const struct route_map_rule_cmd route_match_metric_cmd = {
  81         "metric",
  82         route_match_metric,
  83         route_match_metric_compile,
  84         route_match_metric_free
  85 };
  86
  87 /* `match interface IFNAME' */
  88 /* Match function return 1 if match is success else return zero. */
  89 static enum route_map_cmd_result_t
  90 route_match_interface(void *rule, const struct prefix *prefix, void *object)
  91 {
  92         struct ripng_info *rinfo;
  93         struct interface *ifp;
  94         char *ifname;
  95
  96         ifname = rule;
  97         ifp = if_lookup_by_name(ifname, VRF_DEFAULT);
  98
  99         if (!ifp)
 100                 return RMAP_NOMATCH;
 101
 102         rinfo = object;
 103
 104         if (rinfo->ifindex == ifp->ifindex)
 105                 return RMAP_MATCH;
 106         else
 107                 return RMAP_NOMATCH;
 108
 109         return RMAP_NOMATCH;
 110 }
 111
 112 /* Route map `match interface' match statement. `arg' is IFNAME value */
 113 static void *route_match_interface_compile(const char *arg)
 114 {
 115         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 116 }
 117
 118 static void route_match_interface_free(void *rule)
 119 {
 120         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 121 }
 122
 123 static const struct route_map_rule_cmd route_match_interface_cmd = {
 124         "interface",
 125         route_match_interface,
 126         route_match_interface_compile,
 127         route_match_interface_free
 128 };
 129
 130 /* `match tag TAG' */
 131 /* Match function return 1 if match is success else return zero. */
 132 static enum route_map_cmd_result_t route_match_tag(void *rule,
 133                                                    const struct prefix *prefix,
 134                                                    void *object)
 135 {
 136         route_tag_t *tag;
 137         struct ripng_info *rinfo;
 138         route_tag_t rinfo_tag;
 139
 140         tag = rule;
 141         rinfo = object;
 142
 143         /* The information stored by rinfo is host ordered. */
 144         rinfo_tag = rinfo->tag;
 145         if (rinfo_tag == *tag)
 146                 return RMAP_MATCH;
 147         else
 148                 return RMAP_NOMATCH;
 149 }
 150
 151
 152 static const struct route_map_rule_cmd route_match_tag_cmd = {
 153         "tag",
 154         route_match_tag,
 155         route_map_rule_tag_compile,
 156         route_map_rule_tag_free,
 157 };
 158
 159 /* `set metric METRIC' */
 160
 161 /* Set metric to attribute. */
 162 static enum route_map_cmd_result_t
 163 route_set_metric(void *rule, const struct prefix *prefix, void *object)
 164 {
 165         struct rip_metric_modifier *mod;
 166         struct ripng_info *rinfo;
 167
 168         mod = rule;
 169         rinfo = object;
 170
 171         if (!mod->used)
 172                 return RMAP_OKAY;
 173
 174         if (mod->type == metric_increment)
 175                 rinfo->metric_out += mod->metric;
 176         else if (mod->type == metric_decrement)
 177                 rinfo->metric_out -= mod->metric;
 178         else if (mod->type == metric_absolute)
 179                 rinfo->metric_out = mod->metric;
 180
 181         if (rinfo->metric_out < 1)
 182                 rinfo->metric_out = 1;
 183         if (rinfo->metric_out > RIPNG_METRIC_INFINITY)
 184                 rinfo->metric_out = RIPNG_METRIC_INFINITY;
 185
 186         rinfo->metric_set = 1;
 187
 188         return RMAP_OKAY;
 189 }
 190
 191 /* set metric compilation. */
 192 static void *route_set_metric_compile(const char *arg)
 193 {
 194         int len;
 195         const char *pnt;
 196         long metric;
 197         char *endptr = NULL;
 198         struct rip_metric_modifier *mod;
 199
 200         len = strlen(arg);
 201         pnt = arg;
 202
 203         mod = XMALLOC(MTYPE_ROUTE_MAP_COMPILED,
 204                       sizeof(struct rip_metric_modifier));
 205         mod->used = false;
 206
 207         if (len == 0)
 208                 return mod;
 209
 210         /* Examine first character. */
 211         if (arg[0] == '+') {
 212                 mod->type = metric_increment;
 213                 pnt++;
 214         } else if (arg[0] == '-') {
 215                 mod->type = metric_decrement;
 216                 pnt++;
 217         } else
 218                 mod->type = metric_absolute;
 219
 220         /* Check beginning with digit string. */
 221         if (*pnt < '0' || *pnt > '9')
 222                 return mod;
 223
 224         /* Convert string to integer. */
 225         metric = strtol(pnt, &endptr, 10);
 226
 227         if (*endptr != '\0' || metric < 0)
 228                 return mod;
 229
 230         if (metric > RIPNG_METRIC_INFINITY) {
 231                 zlog_info(
 232                         "%s: Metric specified: %ld is being converted into METRIC_INFINITY",
 233                         __func__, metric);
 234                 mod->metric = RIPNG_METRIC_INFINITY;
 235         } else
 236                 mod->metric = metric;
 237
 238         mod->used = true;
 239         return mod;
 240 }
 241
 242 /* Free route map's compiled `set metric' value. */
 243 static void route_set_metric_free(void *rule)
 244 {
 245         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 246 }
 247
 248 static const struct route_map_rule_cmd route_set_metric_cmd = {
 249         "metric",
 250         route_set_metric,
 251         route_set_metric_compile,
 252         route_set_metric_free,
 253 };
 254
 255 /* `set ipv6 next-hop local IP_ADDRESS' */
 256
 257 /* Set nexthop to object.  object must be pointer to struct attr. */
 258 static enum route_map_cmd_result_t
 259 route_set_ipv6_nexthop_local(void *rule, const struct prefix *p, void *object)
 260 {
 261         struct in6_addr *address;
 262         struct ripng_info *rinfo;
 263
 264         /* Fetch routemap's rule information. */
 265         address = rule;
 266         rinfo = object;
 267
 268         /* Set next hop value. */
 269         rinfo->nexthop_out = *address;
 270
 271         return RMAP_OKAY;
 272 }
 273
 274 /* Route map `ipv6 nexthop local' compile function.  Given string is converted
 275    to struct in6_addr structure. */
 276 static void *route_set_ipv6_nexthop_local_compile(const char *arg)
 277 {
 278         int ret;
 279         struct in6_addr *address;
 280
 281         address = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(struct in6_addr));
 282
 283         ret = inet_pton(AF_INET6, arg, address);
 284
 285         if (ret == 0) {
 286                 XFREE(MTYPE_ROUTE_MAP_COMPILED, address);
 287                 return NULL;
 288         }
 289
 290         return address;
 291 }
 292
 293 /* Free route map's compiled `ipv6 nexthop local' value. */
 294 static void route_set_ipv6_nexthop_local_free(void *rule)
 295 {
 296         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 297 }
 298
 299 /* Route map commands for ipv6 nexthop local set. */
 300 static const struct route_map_rule_cmd
 301                 route_set_ipv6_nexthop_local_cmd = {
 302         "ipv6 next-hop local",
 303         route_set_ipv6_nexthop_local,
 304         route_set_ipv6_nexthop_local_compile,
 305         route_set_ipv6_nexthop_local_free
 306 };
 307
 308 /* `set tag TAG' */
 309
 310 /* Set tag to object.  object must be pointer to struct attr. */
 311 static enum route_map_cmd_result_t
 312 route_set_tag(void *rule, const struct prefix *prefix, void *object)
 313 {
 314         route_tag_t *tag;
 315         struct ripng_info *rinfo;
 316
 317         /* Fetch routemap's rule information. */
 318         tag = rule;
 319         rinfo = object;
 320
 321         /* Set next hop value. */
 322         rinfo->tag_out = *tag;
 323
 324         return RMAP_OKAY;
 325 }
 326
 327 /* Route map commands for tag set. */
 328 static const struct route_map_rule_cmd route_set_tag_cmd = {
 329         "tag",
 330         route_set_tag,
 331         route_map_rule_tag_compile,
 332         route_map_rule_tag_free
 333 };
 334
 335 #define MATCH_STR "Match values from routing table\n"
 336 #define SET_STR "Set values in destination routing protocol\n"
 337
 338 void ripng_route_map_init(void)
 339 {
 340         route_map_init();
 341
 342         route_map_match_interface_hook(generic_match_add);
 343         route_map_no_match_interface_hook(generic_match_delete);
 344
 345         route_map_match_metric_hook(generic_match_add);
 346         route_map_no_match_metric_hook(generic_match_delete);
 347
 348         route_map_match_tag_hook(generic_match_add);
 349         route_map_no_match_tag_hook(generic_match_delete);
 350
 351         route_map_set_ipv6_nexthop_local_hook(generic_set_add);
 352         route_map_no_set_ipv6_nexthop_local_hook(generic_set_delete);
 353
 354         route_map_set_metric_hook(generic_set_add);
 355         route_map_no_set_metric_hook(generic_set_delete);
 356
 357         route_map_set_tag_hook(generic_set_add);
 358         route_map_no_set_tag_hook(generic_set_delete);
 359
 360         route_map_install_match(&route_match_metric_cmd);
 361         route_map_install_match(&route_match_interface_cmd);
 362         route_map_install_match(&route_match_tag_cmd);
 363         route_map_install_set(&route_set_metric_cmd);
 364         route_map_install_set(&route_set_ipv6_nexthop_local_cmd);
 365         route_map_install_set(&route_set_tag_cmd);
 366 }