ospfd/ospf_routemap.c

   1 /*
   2  * Route map function of ospfd.
   3  * Copyright (C) 2000 IP Infusion Inc.
   4  *
   5  * Written by Toshiaki Takada.
   6  *
   7  * This file is part of GNU Zebra.
   8  *
   9  * GNU Zebra is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2, or (at your option) any
  12  * later version.
  13  *
  14  * GNU Zebra is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; see the file COPYING; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <zebra.h>
  25
  26 #include "memory.h"
  27 #include "prefix.h"
  28 #include "table.h"
  29 #include "vty.h"
  30 #include "routemap.h"
  31 #include "command.h"
  32 #include "log.h"
  33 #include "plist.h"
  34 #include "vrf.h"
  35 #include "frrstr.h"
  36
  37 #include "ospfd/ospfd.h"
  38 #include "ospfd/ospf_asbr.h"
  39 #include "ospfd/ospf_interface.h"
  40 #include "ospfd/ospf_lsa.h"
  41 #include "ospfd/ospf_route.h"
  42 #include "ospfd/ospf_zebra.h"
  43 #include "ospfd/ospf_errors.h"
  44
  45 /* Hook function for updating route_map assignment. */
  46 static void ospf_route_map_update(const char *name)
  47 {
  48         struct ospf *ospf;
  49         int type;
  50         struct listnode *n1 = NULL;
  51
  52         /* If OSPF instatnce does not exist, return right now. */
  53         if (listcount(om->ospf) == 0)
  54                 return;
  55
  56         for (ALL_LIST_ELEMENTS_RO(om->ospf, n1, ospf)) {
  57                 /* Update route-map */
  58                 for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) {
  59                         struct list *red_list;
  60                         struct listnode *node;
  61                         struct ospf_redist *red;
  62
  63                         red_list = ospf->redist[type];
  64                         if (!red_list)
  65                                 continue;
  66
  67                         for (ALL_LIST_ELEMENTS_RO(red_list, node, red)) {
  68                                 if (ROUTEMAP_NAME(red)
  69                                     && strcmp(ROUTEMAP_NAME(red), name) == 0) {
  70                                         /* Keep old route-map. */
  71                                         struct route_map *old = ROUTEMAP(red);
  72
  73                                         if (!old) {
  74                                                 /* Route-map creation */
  75                                                 /* Update route-map. */
  76                                                 ROUTEMAP(red) =
  77                                                         route_map_lookup_by_name(
  78                                                                 ROUTEMAP_NAME(red));
  79
  80                                                         route_map_counter_increment(
  81                                                                 ROUTEMAP(red));
  82                                         } else {
  83                                                 /* Route-map deletion */
  84                                                 ROUTEMAP(red) = NULL;
  85                                         }
  86                                         /* No update for this distribute type.
  87                                          */
  88                                         if (old == NULL
  89                                             && ROUTEMAP(red) == NULL)
  90                                                 continue;
  91
  92                                         ospf_distribute_list_update(
  93                                                 ospf, type, red->instance);
  94                                 }
  95                         }
  96                 }
  97         }
  98 }
  99
 100 static void ospf_route_map_event(route_map_event_t event, const char *name)
 101 {
 102         struct ospf *ospf;
 103         int type;
 104         struct listnode *n1 = NULL;
 105
 106         for (ALL_LIST_ELEMENTS_RO(om->ospf, n1, ospf)) {
 107                 for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) {
 108                         struct list *red_list;
 109                         struct listnode *node;
 110                         struct ospf_redist *red;
 111
 112                         red_list = ospf->redist[type];
 113                         if (!red_list)
 114                                 continue;
 115
 116                         for (ALL_LIST_ELEMENTS_RO(red_list, node, red)) {
 117                                 if (ROUTEMAP_NAME(red) && ROUTEMAP(red)
 118                                     && !strcmp(ROUTEMAP_NAME(red), name)) {
 119                                         ospf_distribute_list_update(
 120                                                 ospf, type, red->instance);
 121                                 }
 122                         }
 123                 }
 124         }
 125 }
 126
 127 /* `match ip netxthop ' */
 128 /* Match function return 1 if match is success else return zero. */
 129 static route_map_result_t route_match_ip_nexthop(void *rule,
 130                                                  const struct prefix *prefix,
 131                                                  route_map_object_t type,
 132                                                  void *object)
 133 {
 134         struct access_list *alist;
 135         struct external_info *ei = object;
 136         struct prefix_ipv4 p;
 137
 138         if (type == RMAP_OSPF) {
 139                 p.family = AF_INET;
 140                 p.prefix = ei->nexthop;
 141                 p.prefixlen = IPV4_MAX_BITLEN;
 142
 143                 alist = access_list_lookup(AFI_IP, (char *)rule);
 144                 if (alist == NULL)
 145                         return RMAP_NOMATCH;
 146
 147                 return (access_list_apply(alist, &p) == FILTER_DENY
 148                                 ? RMAP_NOMATCH
 149                                 : RMAP_MATCH);
 150         }
 151         return RMAP_NOMATCH;
 152 }
 153
 154 /* Route map `ip next-hop' match statement. `arg' should be
 155    access-list name. */
 156 static void *route_match_ip_nexthop_compile(const char *arg)
 157 {
 158         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 159 }
 160
 161 /* Free route map's compiled `ip address' value. */
 162 static void route_match_ip_nexthop_free(void *rule)
 163 {
 164         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 165 }
 166
 167 /* Route map commands for metric matching. */
 168 struct route_map_rule_cmd route_match_ip_nexthop_cmd = {
 169         "ip next-hop", route_match_ip_nexthop, route_match_ip_nexthop_compile,
 170         route_match_ip_nexthop_free};
 171
 172 /* `match ip next-hop prefix-list PREFIX_LIST' */
 173
 174 static route_map_result_t
 175 route_match_ip_next_hop_prefix_list(void *rule, const struct prefix *prefix,
 176                                     route_map_object_t type, void *object)
 177 {
 178         struct prefix_list *plist;
 179         struct external_info *ei = object;
 180         struct prefix_ipv4 p;
 181
 182         if (type == RMAP_OSPF) {
 183                 p.family = AF_INET;
 184                 p.prefix = ei->nexthop;
 185                 p.prefixlen = IPV4_MAX_BITLEN;
 186
 187                 plist = prefix_list_lookup(AFI_IP, (char *)rule);
 188                 if (plist == NULL)
 189                         return RMAP_NOMATCH;
 190
 191                 return (prefix_list_apply(plist, &p) == PREFIX_DENY
 192                                 ? RMAP_NOMATCH
 193                                 : RMAP_MATCH);
 194         }
 195         return RMAP_NOMATCH;
 196 }
 197
 198 static void *route_match_ip_next_hop_prefix_list_compile(const char *arg)
 199 {
 200         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 201 }
 202
 203 static void route_match_ip_next_hop_prefix_list_free(void *rule)
 204 {
 205         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 206 }
 207
 208 struct route_map_rule_cmd route_match_ip_next_hop_prefix_list_cmd = {
 209         "ip next-hop prefix-list", route_match_ip_next_hop_prefix_list,
 210         route_match_ip_next_hop_prefix_list_compile,
 211         route_match_ip_next_hop_prefix_list_free};
 212
 213 /* `match ip address IP_ACCESS_LIST' */
 214 /* Match function should return 1 if match is success else return
 215    zero. */
 216 static route_map_result_t route_match_ip_address(void *rule,
 217                                                  const struct prefix *prefix,
 218                                                  route_map_object_t type,
 219                                                  void *object)
 220 {
 221         struct access_list *alist;
 222         /* struct prefix_ipv4 match; */
 223
 224         if (type == RMAP_OSPF) {
 225                 alist = access_list_lookup(AFI_IP, (char *)rule);
 226                 if (alist == NULL)
 227                         return RMAP_NOMATCH;
 228
 229                 return (access_list_apply(alist, prefix) == FILTER_DENY
 230                                 ? RMAP_NOMATCH
 231                                 : RMAP_MATCH);
 232         }
 233         return RMAP_NOMATCH;
 234 }
 235
 236 /* Route map `ip address' match statement.  `arg' should be
 237    access-list name. */
 238 static void *route_match_ip_address_compile(const char *arg)
 239 {
 240         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 241 }
 242
 243 /* Free route map's compiled `ip address' value. */
 244 static void route_match_ip_address_free(void *rule)
 245 {
 246         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 247 }
 248
 249 /* Route map commands for ip address matching. */
 250 struct route_map_rule_cmd route_match_ip_address_cmd = {
 251         "ip address", route_match_ip_address, route_match_ip_address_compile,
 252         route_match_ip_address_free};
 253
 254 /* `match ip address prefix-list PREFIX_LIST' */
 255 static route_map_result_t
 256 route_match_ip_address_prefix_list(void *rule, const struct prefix *prefix,
 257                                    route_map_object_t type, void *object)
 258 {
 259         struct prefix_list *plist;
 260
 261         if (type == RMAP_OSPF) {
 262                 plist = prefix_list_lookup(AFI_IP, (char *)rule);
 263                 if (plist == NULL)
 264                         return RMAP_NOMATCH;
 265
 266                 return (prefix_list_apply(plist, prefix) == PREFIX_DENY
 267                                 ? RMAP_NOMATCH
 268                                 : RMAP_MATCH);
 269         }
 270         return RMAP_NOMATCH;
 271 }
 272
 273 static void *route_match_ip_address_prefix_list_compile(const char *arg)
 274 {
 275         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 276 }
 277
 278 static void route_match_ip_address_prefix_list_free(void *rule)
 279 {
 280         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 281 }
 282
 283 struct route_map_rule_cmd route_match_ip_address_prefix_list_cmd = {
 284         "ip address prefix-list", route_match_ip_address_prefix_list,
 285         route_match_ip_address_prefix_list_compile,
 286         route_match_ip_address_prefix_list_free};
 287
 288 /* `match interface IFNAME' */
 289 /* Match function should return 1 if match is success else return
 290    zero. */
 291 static route_map_result_t route_match_interface(void *rule,
 292                                                 const struct prefix *prefix,
 293                                                 route_map_object_t type,
 294                                                 void *object)
 295 {
 296         struct interface *ifp;
 297         struct external_info *ei;
 298
 299         if (type == RMAP_OSPF) {
 300                 ei = object;
 301                 ifp = if_lookup_by_name_all_vrf((char *)rule);
 302
 303                 if (ifp == NULL || ifp->ifindex != ei->ifindex)
 304                         return RMAP_NOMATCH;
 305
 306                 return RMAP_MATCH;
 307         }
 308         return RMAP_NOMATCH;
 309 }
 310
 311 /* Route map `interface' match statement.  `arg' should be
 312    interface name. */
 313 static void *route_match_interface_compile(const char *arg)
 314 {
 315         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 316 }
 317
 318 /* Free route map's compiled `interface' value. */
 319 static void route_match_interface_free(void *rule)
 320 {
 321         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 322 }
 323
 324 /* Route map commands for ip address matching. */
 325 struct route_map_rule_cmd route_match_interface_cmd = {
 326         "interface", route_match_interface, route_match_interface_compile,
 327         route_match_interface_free};
 328
 329 /* Match function return 1 if match is success else return zero. */
 330 static route_map_result_t route_match_tag(void *rule,
 331                                           const struct prefix *prefix,
 332                                           route_map_object_t type, void *object)
 333 {
 334         route_tag_t *tag;
 335         struct external_info *ei;
 336
 337         if (type == RMAP_OSPF) {
 338                 tag = rule;
 339                 ei = object;
 340
 341                 return ((ei->tag == *tag) ? RMAP_MATCH : RMAP_NOMATCH);
 342         }
 343
 344         return RMAP_NOMATCH;
 345 }
 346
 347 /* Route map commands for tag matching. */
 348 static struct route_map_rule_cmd route_match_tag_cmd = {
 349         "tag", route_match_tag, route_map_rule_tag_compile,
 350         route_map_rule_tag_free,
 351 };
 352
 353 struct ospf_metric {
 354         enum { metric_increment, metric_decrement, metric_absolute } type;
 355         bool used;
 356         uint32_t metric;
 357 };
 358
 359 /* `set metric METRIC' */
 360 /* Set metric to attribute. */
 361 static route_map_result_t route_set_metric(void *rule,
 362                                            const struct prefix *prefix,
 363                                            route_map_object_t type,
 364                                            void *object)
 365 {
 366         struct ospf_metric *metric;
 367         struct external_info *ei;
 368
 369         if (type == RMAP_OSPF) {
 370                 /* Fetch routemap's rule information. */
 371                 metric = rule;
 372                 ei = object;
 373
 374                 /* Set metric out value. */
 375                 if (!metric->used)
 376                         return RMAP_OKAY;
 377                 if (metric->type == metric_increment)
 378                         ei->route_map_set.metric += metric->metric;
 379                 if (metric->type == metric_decrement)
 380                         ei->route_map_set.metric -= metric->metric;
 381                 if (metric->type == metric_absolute)
 382                         ei->route_map_set.metric = metric->metric;
 383
 384                 if ((signed int)ei->route_map_set.metric < 1)
 385                         ei->route_map_set.metric = -1;
 386                 if (ei->route_map_set.metric > OSPF_LS_INFINITY)
 387                         ei->route_map_set.metric = OSPF_LS_INFINITY;
 388         }
 389         return RMAP_OKAY;
 390 }
 391
 392 /* set metric compilation. */
 393 static void *route_set_metric_compile(const char *arg)
 394 {
 395         struct ospf_metric *metric;
 396
 397         metric = XCALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(uint32_t));
 398         metric->used = false;
 399
 400         if (all_digit(arg))
 401                 metric->type = metric_absolute;
 402
 403         if (strmatch(arg, "+rtt") || strmatch(arg, "-rtt")) {
 404                 flog_warn(EC_OSPF_SET_METRIC_PLUS,
 405                           "OSPF does not support 'set metric +rtt / -rtt'");
 406                 return metric;
 407         }
 408
 409         if ((arg[0] == '+') && all_digit(arg + 1)) {
 410                 metric->type = metric_increment;
 411                 arg++;
 412         }
 413
 414         if ((arg[0] == '-') && all_digit(arg + 1)) {
 415                 metric->type = metric_decrement;
 416                 arg++;
 417         }
 418
 419         metric->metric = strtoul(arg, NULL, 10);
 420
 421         if (metric->metric)
 422                 metric->used = true;
 423
 424         return metric;
 425 }
 426
 427 /* Free route map's compiled `set metric' value. */
 428 static void route_set_metric_free(void *rule)
 429 {
 430         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 431 }
 432
 433 /* Set metric rule structure. */
 434 struct route_map_rule_cmd route_set_metric_cmd = {
 435         "metric", route_set_metric, route_set_metric_compile,
 436         route_set_metric_free,
 437 };
 438
 439 /* `set metric-type TYPE' */
 440 /* Set metric-type to attribute. */
 441 static route_map_result_t route_set_metric_type(void *rule,
 442                                                 const struct prefix *prefix,
 443                                                 route_map_object_t type,
 444                                                 void *object)
 445 {
 446         uint32_t *metric_type;
 447         struct external_info *ei;
 448
 449         if (type == RMAP_OSPF) {
 450                 /* Fetch routemap's rule information. */
 451                 metric_type = rule;
 452                 ei = object;
 453
 454                 /* Set metric out value. */
 455                 ei->route_map_set.metric_type = *metric_type;
 456         }
 457         return RMAP_OKAY;
 458 }
 459
 460 /* set metric-type compilation. */
 461 static void *route_set_metric_type_compile(const char *arg)
 462 {
 463         uint32_t *metric_type;
 464
 465         metric_type = XCALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(uint32_t));
 466         if (strcmp(arg, "type-1") == 0)
 467                 *metric_type = EXTERNAL_METRIC_TYPE_1;
 468         else if (strcmp(arg, "type-2") == 0)
 469                 *metric_type = EXTERNAL_METRIC_TYPE_2;
 470
 471         if (*metric_type == EXTERNAL_METRIC_TYPE_1
 472             || *metric_type == EXTERNAL_METRIC_TYPE_2)
 473                 return metric_type;
 474
 475         XFREE(MTYPE_ROUTE_MAP_COMPILED, metric_type);
 476         return NULL;
 477 }
 478
 479 /* Free route map's compiled `set metric-type' value. */
 480 static void route_set_metric_type_free(void *rule)
 481 {
 482         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 483 }
 484
 485 /* Set metric rule structure. */
 486 struct route_map_rule_cmd route_set_metric_type_cmd = {
 487         "metric-type", route_set_metric_type, route_set_metric_type_compile,
 488         route_set_metric_type_free,
 489 };
 490
 491 static route_map_result_t route_set_tag(void *rule, const struct prefix *prefix,
 492                                         route_map_object_t type, void *object)
 493 {
 494         route_tag_t *tag;
 495         struct external_info *ei;
 496
 497         if (type == RMAP_OSPF) {
 498                 tag = rule;
 499                 ei = object;
 500
 501                 /* Set tag value */
 502                 ei->tag = *tag;
 503         }
 504
 505         return RMAP_OKAY;
 506 }
 507
 508 /* Route map commands for tag set. */
 509 static struct route_map_rule_cmd route_set_tag_cmd = {
 510         "tag", route_set_tag, route_map_rule_tag_compile,
 511         route_map_rule_tag_free,
 512 };
 513
 514 DEFUN (set_metric_type,
 515        set_metric_type_cmd,
 516        "set metric-type <type-1|type-2>",
 517        SET_STR
 518        "Type of metric for destination routing protocol\n"
 519        "OSPF[6] external type 1 metric\n"
 520        "OSPF[6] external type 2 metric\n")
 521 {
 522         char *ext = argv[2]->text;
 523         return generic_set_add(vty, VTY_GET_CONTEXT(route_map_index),
 524                                "metric-type", ext);
 525 }
 526
 527 DEFUN (no_set_metric_type,
 528        no_set_metric_type_cmd,
 529        "no set metric-type [<type-1|type-2>]",
 530        NO_STR
 531        SET_STR
 532        "Type of metric for destination routing protocol\n"
 533        "OSPF[6] external type 1 metric\n"
 534        "OSPF[6] external type 2 metric\n")
 535 {
 536         char *ext = (argc == 4) ? argv[3]->text : NULL;
 537         return generic_set_delete(vty, VTY_GET_CONTEXT(route_map_index),
 538                                   "metric-type", ext);
 539 }
 540
 541 /* Route-map init */
 542 void ospf_route_map_init(void)
 543 {
 544         route_map_init();
 545
 546         route_map_add_hook(ospf_route_map_update);
 547         route_map_delete_hook(ospf_route_map_update);
 548         route_map_event_hook(ospf_route_map_event);
 549
 550         route_map_set_metric_hook(generic_set_add);
 551         route_map_no_set_metric_hook(generic_set_delete);
 552
 553         route_map_match_ip_next_hop_hook(generic_match_add);
 554         route_map_no_match_ip_next_hop_hook(generic_match_delete);
 555
 556         route_map_match_interface_hook(generic_match_add);
 557         route_map_no_match_interface_hook(generic_match_delete);
 558
 559         route_map_match_ip_address_hook(generic_match_add);
 560         route_map_no_match_ip_address_hook(generic_match_delete);
 561
 562         route_map_match_ip_address_prefix_list_hook(generic_match_add);
 563         route_map_no_match_ip_address_prefix_list_hook(generic_match_delete);
 564
 565         route_map_match_ip_next_hop_prefix_list_hook(generic_match_add);
 566         route_map_no_match_ip_next_hop_prefix_list_hook(generic_match_delete);
 567
 568         route_map_match_tag_hook(generic_match_add);
 569         route_map_no_match_tag_hook(generic_match_delete);
 570
 571         route_map_set_metric_hook(generic_set_add);
 572         route_map_no_set_metric_hook(generic_set_delete);
 573
 574         route_map_set_tag_hook(generic_set_add);
 575         route_map_no_set_tag_hook(generic_set_delete);
 576
 577         route_map_install_match(&route_match_ip_nexthop_cmd);
 578         route_map_install_match(&route_match_ip_next_hop_prefix_list_cmd);
 579         route_map_install_match(&route_match_ip_address_cmd);
 580         route_map_install_match(&route_match_ip_address_prefix_list_cmd);
 581         route_map_install_match(&route_match_interface_cmd);
 582         route_map_install_match(&route_match_tag_cmd);
 583
 584         route_map_install_set(&route_set_metric_cmd);
 585         route_map_install_set(&route_set_metric_type_cmd);
 586         route_map_install_set(&route_set_tag_cmd);
 587
 588         install_element(RMAP_NODE, &set_metric_type_cmd);
 589         install_element(RMAP_NODE, &no_set_metric_type_cmd);
 590 }