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
  17  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "if.h"
  25 #include "memory.h"
  26 #include "prefix.h"
  27 #include "vty.h"
  28 #include "routemap.h"
  29 #include "command.h"
  30 #include "sockunion.h"
  31
  32 #include "ripngd/ripngd.h"
  33
  34 struct rip_metric_modifier
  35 {
  36   enum
  37   {
  38     metric_increment,
  39     metric_decrement,
  40     metric_absolute
  41   } type;
  42
  43   u_char metric;
  44 };
  45
  46 /* `match metric METRIC' */
  47 /* Match function return 1 if match is success else return zero. */
  48 static route_map_result_t
  49 route_match_metric (void *rule, struct prefix *prefix,
  50                     route_map_object_t type, void *object)
  51 {
  52   u_int32_t *metric;
  53   struct ripng_info *rinfo;
  54
  55   if (type == RMAP_RIPNG)
  56     {
  57       metric = rule;
  58       rinfo = object;
  59
  60       if (rinfo->metric == *metric)
  61         return RMAP_MATCH;
  62       else
  63         return RMAP_NOMATCH;
  64     }
  65   return RMAP_NOMATCH;
  66 }
  67
  68 /* Route map `match metric' match statement. `arg' is METRIC value */
  69 static void *
  70 route_match_metric_compile (const char *arg)
  71 {
  72   u_int32_t *metric;
  73
  74   metric = XMALLOC (MTYPE_ROUTE_MAP_COMPILED, sizeof (u_int32_t));
  75   *metric = atoi (arg);
  76
  77   if(*metric > 0)
  78     return metric;
  79
  80   XFREE (MTYPE_ROUTE_MAP_COMPILED, metric);
  81   return NULL;
  82 }
  83
  84 /* Free route map's compiled `match metric' value. */
  85 static void
  86 route_match_metric_free (void *rule)
  87 {
  88   XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
  89 }
  90
  91 /* Route map commands for metric matching. */
  92 static struct route_map_rule_cmd route_match_metric_cmd =
  93 {
  94   "metric",
  95   route_match_metric,
  96   route_match_metric_compile,
  97   route_match_metric_free
  98 };
  99
 100 /* `match interface IFNAME' */
 101 /* Match function return 1 if match is success else return zero. */
 102 static route_map_result_t
 103 route_match_interface (void *rule, struct prefix *prefix,
 104                        route_map_object_t type, void *object)
 105 {
 106   struct ripng_info *rinfo;
 107   struct interface *ifp;
 108   char *ifname;
 109
 110   if (type == RMAP_RIPNG)
 111     {
 112       ifname = rule;
 113       ifp = if_lookup_by_name(ifname);
 114
 115       if (!ifp)
 116         return RMAP_NOMATCH;
 117
 118       rinfo = object;
 119
 120       if (rinfo->ifindex == ifp->ifindex)
 121         return RMAP_MATCH;
 122       else
 123         return RMAP_NOMATCH;
 124     }
 125   return RMAP_NOMATCH;
 126 }
 127
 128 /* Route map `match interface' match statement. `arg' is IFNAME value */
 129 static void *
 130 route_match_interface_compile (const char *arg)
 131 {
 132   return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
 133 }
 134
 135 static void
 136 route_match_interface_free (void *rule)
 137 {
 138   XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
 139 }
 140
 141 static struct route_map_rule_cmd route_match_interface_cmd =
 142 {
 143   "interface",
 144   route_match_interface,
 145   route_match_interface_compile,
 146   route_match_interface_free
 147 };
 148
 149 /* `match tag TAG' */
 150 /* Match function return 1 if match is success else return zero. */
 151 static route_map_result_t
 152 route_match_tag (void *rule, struct prefix *prefix,
 153                     route_map_object_t type, void *object)
 154 {
 155   route_tag_t *tag;
 156   struct ripng_info *rinfo;
 157   route_tag_t rinfo_tag;
 158
 159   if (type == RMAP_RIPNG)
 160     {
 161       tag = rule;
 162       rinfo = object;
 163
 164       /* The information stored by rinfo is host ordered. */
 165       rinfo_tag = rinfo->tag;
 166       if (rinfo_tag == *tag)
 167         return RMAP_MATCH;
 168       else
 169         return RMAP_NOMATCH;
 170     }
 171   return RMAP_NOMATCH;
 172 }
 173
 174 static struct route_map_rule_cmd route_match_tag_cmd =
 175 {
 176   "tag",
 177   route_match_tag,
 178   route_map_rule_tag_compile,
 179   route_map_rule_tag_free,
 180 };
 181
 182 /* `set metric METRIC' */
 183
 184 /* Set metric to attribute. */
 185 static route_map_result_t
 186 route_set_metric (void *rule, struct prefix *prefix,
 187                   route_map_object_t type, void *object)
 188 {
 189   if (type == RMAP_RIPNG)
 190     {
 191       struct rip_metric_modifier *mod;
 192       struct ripng_info *rinfo;
 193
 194       mod = rule;
 195       rinfo = object;
 196
 197       if (mod->type == metric_increment)
 198         rinfo->metric_out += mod->metric;
 199       else if (mod->type == metric_decrement)
 200         rinfo->metric_out-= mod->metric;
 201       else if (mod->type == metric_absolute)
 202         rinfo->metric_out = mod->metric;
 203
 204       if (rinfo->metric_out < 1)
 205         rinfo->metric_out = 1;
 206       if (rinfo->metric_out > RIPNG_METRIC_INFINITY)
 207         rinfo->metric_out = RIPNG_METRIC_INFINITY;
 208
 209       rinfo->metric_set = 1;
 210     }
 211   return RMAP_OKAY;
 212 }
 213
 214 /* set metric compilation. */
 215 static void *
 216 route_set_metric_compile (const char *arg)
 217 {
 218   int len;
 219   const char *pnt;
 220   int type;
 221   long metric;
 222   char *endptr = NULL;
 223   struct rip_metric_modifier *mod;
 224
 225   len = strlen (arg);
 226   pnt = arg;
 227
 228   if (len == 0)
 229     return NULL;
 230
 231   /* Examine first character. */
 232   if (arg[0] == '+')
 233     {
 234       type = metric_increment;
 235       pnt++;
 236     }
 237   else if (arg[0] == '-')
 238     {
 239       type = metric_decrement;
 240       pnt++;
 241     }
 242   else
 243     type = metric_absolute;
 244
 245   /* Check beginning with digit string. */
 246   if (*pnt < '0' || *pnt > '9')
 247     return NULL;
 248
 249   /* Convert string to integer. */
 250   metric = strtol (pnt, &endptr, 10);
 251
 252   if (metric == LONG_MAX || *endptr != '\0')
 253     return NULL;
 254   /* Commented out by Hasso Tepper, to avoid problems in vtysh. */
 255   /* if (metric < 0 || metric > RIPNG_METRIC_INFINITY) */
 256   if (metric < 0)
 257     return NULL;
 258
 259   mod = XMALLOC (MTYPE_ROUTE_MAP_COMPILED,
 260                  sizeof (struct rip_metric_modifier));
 261   mod->type = type;
 262   mod->metric = metric;
 263
 264   return mod;
 265 }
 266
 267 /* Free route map's compiled `set metric' value. */
 268 static void
 269 route_set_metric_free (void *rule)
 270 {
 271   XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
 272 }
 273
 274 static struct route_map_rule_cmd route_set_metric_cmd =
 275 {
 276   "metric",
 277   route_set_metric,
 278   route_set_metric_compile,
 279   route_set_metric_free,
 280 };
 281
 282 /* `set ipv6 next-hop local IP_ADDRESS' */
 283
 284 /* Set nexthop to object.  ojbect must be pointer to struct attr. */
 285 static route_map_result_t
 286 route_set_ipv6_nexthop_local (void *rule, struct prefix *prefix,
 287                       route_map_object_t type, void *object)
 288 {
 289   struct in6_addr *address;
 290   struct ripng_info *rinfo;
 291
 292   if(type == RMAP_RIPNG)
 293     {
 294       /* Fetch routemap's rule information. */
 295       address = rule;
 296       rinfo = object;
 297
 298       /* Set next hop value. */
 299       rinfo->nexthop_out = *address;
 300     }
 301
 302   return RMAP_OKAY;
 303 }
 304
 305 /* Route map `ipv6 nexthop local' compile function.  Given string is converted
 306    to struct in6_addr structure. */
 307 static void *
 308 route_set_ipv6_nexthop_local_compile (const char *arg)
 309 {
 310   int ret;
 311   struct in6_addr *address;
 312
 313   address = XMALLOC (MTYPE_ROUTE_MAP_COMPILED, sizeof (struct in6_addr));
 314
 315   ret = inet_pton (AF_INET6, arg, address);
 316
 317   if (ret == 0)
 318     {
 319       XFREE (MTYPE_ROUTE_MAP_COMPILED, address);
 320       return NULL;
 321     }
 322
 323   return address;
 324 }
 325
 326 /* Free route map's compiled `ipv6 nexthop local' value. */
 327 static void
 328 route_set_ipv6_nexthop_local_free (void *rule)
 329 {
 330   XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
 331 }
 332
 333 /* Route map commands for ipv6 nexthop local set. */
 334 static struct route_map_rule_cmd route_set_ipv6_nexthop_local_cmd =
 335 {
 336   "ipv6 next-hop local",
 337   route_set_ipv6_nexthop_local,
 338   route_set_ipv6_nexthop_local_compile,
 339   route_set_ipv6_nexthop_local_free
 340 };
 341
 342 /* `set tag TAG' */
 343
 344 /* Set tag to object.  ojbect must be pointer to struct attr. */
 345 static route_map_result_t
 346 route_set_tag (void *rule, struct prefix *prefix,
 347                       route_map_object_t type, void *object)
 348 {
 349   route_tag_t *tag;
 350   struct ripng_info *rinfo;
 351
 352   if(type == RMAP_RIPNG)
 353     {
 354       /* Fetch routemap's rule information. */
 355       tag = rule;
 356       rinfo = object;
 357
 358       /* Set next hop value. */
 359       rinfo->tag_out = *tag;
 360     }
 361
 362   return RMAP_OKAY;
 363 }
 364
 365 /* Route map commands for tag set. */
 366 static struct route_map_rule_cmd route_set_tag_cmd =
 367 {
 368   "tag",
 369   route_set_tag,
 370   route_map_rule_tag_compile,
 371   route_map_rule_tag_free
 372 };
 373
 374 #define MATCH_STR "Match values from routing table\n"
 375 #define SET_STR "Set values in destination routing protocol\n"
 376
 377 void
 378 ripng_route_map_reset ()
 379 {
 380   /* XXX ??? */
 381   ;
 382 }
 383
 384 void
 385 ripng_route_map_init ()
 386 {
 387   route_map_init ();
 388
 389   route_map_match_interface_hook (generic_match_add);
 390   route_map_no_match_interface_hook (generic_match_delete);
 391
 392   route_map_match_metric_hook (generic_match_add);
 393   route_map_no_match_metric_hook (generic_match_delete);
 394
 395   route_map_match_tag_hook (generic_match_add);
 396   route_map_no_match_tag_hook (generic_match_delete);
 397
 398   route_map_set_ipv6_nexthop_local_hook (generic_set_add);
 399   route_map_no_set_ipv6_nexthop_local_hook (generic_set_delete);
 400
 401   route_map_set_metric_hook (generic_set_add);
 402   route_map_no_set_metric_hook (generic_set_delete);
 403
 404   route_map_set_tag_hook (generic_set_add);
 405   route_map_no_set_tag_hook (generic_set_delete);
 406
 407   route_map_install_match (&route_match_metric_cmd);
 408   route_map_install_match (&route_match_interface_cmd);
 409   route_map_install_match (&route_match_tag_cmd);
 410   route_map_install_set (&route_set_metric_cmd);
 411   route_map_install_set (&route_set_ipv6_nexthop_local_cmd);
 412   route_map_install_set (&route_set_tag_cmd);
 413 }