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