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,
  43                    route_map_object_t type, void *object)
  44 {
  45         uint32_t *metric;
  46         struct ripng_info *rinfo;
  47
  48         if (type == RMAP_RIPNG) {
  49                 metric = rule;
  50                 rinfo = object;
  51
  52                 if (rinfo->metric == *metric)
  53                         return RMAP_MATCH;
  54                 else
  55                         return RMAP_NOMATCH;
  56         }
  57         return RMAP_NOMATCH;
  58 }
  59
  60 /* Route map `match metric' match statement. `arg' is METRIC value */
  61 static void *route_match_metric_compile(const char *arg)
  62 {
  63         uint32_t *metric;
  64
  65         metric = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(uint32_t));
  66         *metric = atoi(arg);
  67
  68         if (*metric > 0)
  69                 return metric;
  70
  71         XFREE(MTYPE_ROUTE_MAP_COMPILED, metric);
  72         return NULL;
  73 }
  74
  75 /* Free route map's compiled `match metric' value. */
  76 static void route_match_metric_free(void *rule)
  77 {
  78         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
  79 }
  80
  81 /* Route map commands for metric matching. */
  82 static const struct route_map_rule_cmd route_match_metric_cmd = {
  83         "metric",
  84         route_match_metric,
  85         route_match_metric_compile,
  86         route_match_metric_free
  87 };
  88
  89 /* `match interface IFNAME' */
  90 /* Match function return 1 if match is success else return zero. */
  91 static enum route_map_cmd_result_t
  92 route_match_interface(void *rule, const struct prefix *prefix,
  93                       route_map_object_t type, void *object)
  94 {
  95         struct ripng_info *rinfo;
  96         struct interface *ifp;
  97         char *ifname;
  98
  99         if (type == RMAP_RIPNG) {
 100                 ifname = rule;
 101                 ifp = if_lookup_by_name(ifname, VRF_DEFAULT);
 102
 103                 if (!ifp)
 104                         return RMAP_NOMATCH;
 105
 106                 rinfo = object;
 107
 108                 if (rinfo->ifindex == ifp->ifindex)
 109                         return RMAP_MATCH;
 110                 else
 111                         return RMAP_NOMATCH;
 112         }
 113         return RMAP_NOMATCH;
 114 }
 115
 116 /* Route map `match interface' match statement. `arg' is IFNAME value */
 117 static void *route_match_interface_compile(const char *arg)
 118 {
 119         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 120 }
 121
 122 static void route_match_interface_free(void *rule)
 123 {
 124         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 125 }
 126
 127 static const struct route_map_rule_cmd route_match_interface_cmd = {
 128         "interface",
 129         route_match_interface,
 130         route_match_interface_compile,
 131         route_match_interface_free
 132 };
 133
 134 /* `match tag TAG' */
 135 /* Match function return 1 if match is success else return zero. */
 136 static enum route_map_cmd_result_t route_match_tag(void *rule,
 137                                                    const struct prefix *prefix,
 138                                                    route_map_object_t type,
 139                                                    void *object)
 140 {
 141         route_tag_t *tag;
 142         struct ripng_info *rinfo;
 143         route_tag_t rinfo_tag;
 144
 145         if (type == RMAP_RIPNG) {
 146                 tag = rule;
 147                 rinfo = object;
 148
 149                 /* The information stored by rinfo is host ordered. */
 150                 rinfo_tag = rinfo->tag;
 151                 if (rinfo_tag == *tag)
 152                         return RMAP_MATCH;
 153                 else
 154                         return RMAP_NOMATCH;
 155         }
 156         return RMAP_NOMATCH;
 157 }
 158
 159 static const struct route_map_rule_cmd route_match_tag_cmd = {
 160         "tag",
 161         route_match_tag,
 162         route_map_rule_tag_compile,
 163         route_map_rule_tag_free,
 164 };
 165
 166 /* `set metric METRIC' */
 167
 168 /* Set metric to attribute. */
 169 static enum route_map_cmd_result_t
 170 route_set_metric(void *rule, const struct prefix *prefix,
 171                  route_map_object_t type, void *object)
 172 {
 173         if (type == RMAP_RIPNG) {
 174                 struct rip_metric_modifier *mod;
 175                 struct ripng_info *rinfo;
 176
 177                 mod = rule;
 178                 rinfo = object;
 179
 180                 if (!mod->used)
 181                         return RMAP_OKAY;
 182
 183                 if (mod->type == metric_increment)
 184                         rinfo->metric_out += mod->metric;
 185                 else if (mod->type == metric_decrement)
 186                         rinfo->metric_out -= mod->metric;
 187                 else if (mod->type == metric_absolute)
 188                         rinfo->metric_out = mod->metric;
 189
 190                 if (rinfo->metric_out < 1)
 191                         rinfo->metric_out = 1;
 192                 if (rinfo->metric_out > RIPNG_METRIC_INFINITY)
 193                         rinfo->metric_out = RIPNG_METRIC_INFINITY;
 194
 195                 rinfo->metric_set = 1;
 196         }
 197         return RMAP_OKAY;
 198 }
 199
 200 /* set metric compilation. */
 201 static void *route_set_metric_compile(const char *arg)
 202 {
 203         int len;
 204         const char *pnt;
 205         long metric;
 206         char *endptr = NULL;
 207         struct rip_metric_modifier *mod;
 208
 209         len = strlen(arg);
 210         pnt = arg;
 211
 212         mod = XMALLOC(MTYPE_ROUTE_MAP_COMPILED,
 213                       sizeof(struct rip_metric_modifier));
 214         mod->used = false;
 215
 216         if (len == 0)
 217                 return mod;
 218
 219         /* Examine first character. */
 220         if (arg[0] == '+') {
 221                 mod->type = metric_increment;
 222                 pnt++;
 223         } else if (arg[0] == '-') {
 224                 mod->type = metric_decrement;
 225                 pnt++;
 226         } else
 227                 mod->type = metric_absolute;
 228
 229         /* Check beginning with digit string. */
 230         if (*pnt < '0' || *pnt > '9')
 231                 return mod;
 232
 233         /* Convert string to integer. */
 234         metric = strtol(pnt, &endptr, 10);
 235
 236         if (*endptr != '\0' || metric < 0)
 237                 return mod;
 238
 239         if (metric > RIPNG_METRIC_INFINITY) {
 240                 zlog_info("%s: Metric specified: %ld is being converted into METRIC_INFINITY",
 241                           __PRETTY_FUNCTION__,
 242                           metric);
 243                 mod->metric = RIPNG_METRIC_INFINITY;
 244         } else
 245                 mod->metric = metric;
 246
 247         mod->used = true;
 248         return mod;
 249 }
 250
 251 /* Free route map's compiled `set metric' value. */
 252 static void route_set_metric_free(void *rule)
 253 {
 254         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 255 }
 256
 257 static const struct route_map_rule_cmd route_set_metric_cmd = {
 258         "metric",
 259         route_set_metric,
 260         route_set_metric_compile,
 261         route_set_metric_free,
 262 };
 263
 264 /* `set ipv6 next-hop local IP_ADDRESS' */
 265
 266 /* Set nexthop to object.  ojbect must be pointer to struct attr. */
 267 static enum route_map_cmd_result_t
 268 route_set_ipv6_nexthop_local(void *rule, const struct prefix *p,
 269                              route_map_object_t type, void *object)
 270 {
 271         struct in6_addr *address;
 272         struct ripng_info *rinfo;
 273
 274         if (type == RMAP_RIPNG) {
 275                 /* Fetch routemap's rule information. */
 276                 address = rule;
 277                 rinfo = object;
 278
 279                 /* Set next hop value. */
 280                 rinfo->nexthop_out = *address;
 281         }
 282
 283         return RMAP_OKAY;
 284 }
 285
 286 /* Route map `ipv6 nexthop local' compile function.  Given string is converted
 287    to struct in6_addr structure. */
 288 static void *route_set_ipv6_nexthop_local_compile(const char *arg)
 289 {
 290         int ret;
 291         struct in6_addr *address;
 292
 293         address = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(struct in6_addr));
 294
 295         ret = inet_pton(AF_INET6, arg, address);
 296
 297         if (ret == 0) {
 298                 XFREE(MTYPE_ROUTE_MAP_COMPILED, address);
 299                 return NULL;
 300         }
 301
 302         return address;
 303 }
 304
 305 /* Free route map's compiled `ipv6 nexthop local' value. */
 306 static void route_set_ipv6_nexthop_local_free(void *rule)
 307 {
 308         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 309 }
 310
 311 /* Route map commands for ipv6 nexthop local set. */
 312 static const struct route_map_rule_cmd
 313                 route_set_ipv6_nexthop_local_cmd = {
 314         "ipv6 next-hop local",
 315         route_set_ipv6_nexthop_local,
 316         route_set_ipv6_nexthop_local_compile,
 317         route_set_ipv6_nexthop_local_free
 318 };
 319
 320 /* `set tag TAG' */
 321
 322 /* Set tag to object.  ojbect must be pointer to struct attr. */
 323 static enum route_map_cmd_result_t
 324 route_set_tag(void *rule, const struct prefix *prefix, route_map_object_t type,
 325               void *object)
 326 {
 327         route_tag_t *tag;
 328         struct ripng_info *rinfo;
 329
 330         if (type == RMAP_RIPNG) {
 331                 /* Fetch routemap's rule information. */
 332                 tag = rule;
 333                 rinfo = object;
 334
 335                 /* Set next hop value. */
 336                 rinfo->tag_out = *tag;
 337         }
 338
 339         return RMAP_OKAY;
 340 }
 341
 342 /* Route map commands for tag set. */
 343 static const struct route_map_rule_cmd route_set_tag_cmd = {
 344         "tag",
 345         route_set_tag,
 346         route_map_rule_tag_compile,
 347         route_map_rule_tag_free
 348 };
 349
 350 #define MATCH_STR "Match values from routing table\n"
 351 #define SET_STR "Set values in destination routing protocol\n"
 352
 353 void ripng_route_map_init(void)
 354 {
 355         route_map_init();
 356
 357         route_map_match_interface_hook(generic_match_add);
 358         route_map_no_match_interface_hook(generic_match_delete);
 359
 360         route_map_match_metric_hook(generic_match_add);
 361         route_map_no_match_metric_hook(generic_match_delete);
 362
 363         route_map_match_tag_hook(generic_match_add);
 364         route_map_no_match_tag_hook(generic_match_delete);
 365
 366         route_map_set_ipv6_nexthop_local_hook(generic_set_add);
 367         route_map_no_set_ipv6_nexthop_local_hook(generic_set_delete);
 368
 369         route_map_set_metric_hook(generic_set_add);
 370         route_map_no_set_metric_hook(generic_set_delete);
 371
 372         route_map_set_tag_hook(generic_set_add);
 373         route_map_no_set_tag_hook(generic_set_delete);
 374
 375         route_map_install_match(&route_match_metric_cmd);
 376         route_map_install_match(&route_match_interface_cmd);
 377         route_map_install_match(&route_match_tag_cmd);
 378         route_map_install_set(&route_set_metric_cmd);
 379         route_map_install_set(&route_set_ipv6_nexthop_local_cmd);
 380         route_map_install_set(&route_set_tag_cmd);
 381 }