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         enum { metric_increment, metric_decrement, metric_absolute } type;
  36
  37         u_char metric;
  38 };
  39
  40 /* `match metric METRIC' */
  41 /* Match function return 1 if match is success else return zero. */
  42 static route_map_result_t route_match_metric(void *rule, struct prefix *prefix,
  43                                              route_map_object_t type,
  44                                              void *object)
  45 {
  46         u_int32_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         u_int32_t *metric;
  65
  66         metric = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(u_int32_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                                                 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, struct prefix *prefix,
 133                                           route_map_object_t type, void *object)
 134 {
 135         route_tag_t *tag;
 136         struct ripng_info *rinfo;
 137         route_tag_t rinfo_tag;
 138
 139         if (type == RMAP_RIPNG) {
 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         return RMAP_NOMATCH;
 151 }
 152
 153 static struct route_map_rule_cmd route_match_tag_cmd = {
 154         "tag", route_match_tag, route_map_rule_tag_compile,
 155         route_map_rule_tag_free,
 156 };
 157
 158 /* `set metric METRIC' */
 159
 160 /* Set metric to attribute. */
 161 static route_map_result_t route_set_metric(void *rule, struct prefix *prefix,
 162                                            route_map_object_t type,
 163                                            void *object)
 164 {
 165         if (type == RMAP_RIPNG) {
 166                 struct rip_metric_modifier *mod;
 167                 struct ripng_info *rinfo;
 168
 169                 mod = rule;
 170                 rinfo = object;
 171
 172                 if (mod->type == metric_increment)
 173                         rinfo->metric_out += mod->metric;
 174                 else if (mod->type == metric_decrement)
 175                         rinfo->metric_out -= mod->metric;
 176                 else if (mod->type == metric_absolute)
 177                         rinfo->metric_out = mod->metric;
 178
 179                 if (rinfo->metric_out < 1)
 180                         rinfo->metric_out = 1;
 181                 if (rinfo->metric_out > RIPNG_METRIC_INFINITY)
 182                         rinfo->metric_out = RIPNG_METRIC_INFINITY;
 183
 184                 rinfo->metric_set = 1;
 185         }
 186         return RMAP_OKAY;
 187 }
 188
 189 /* set metric compilation. */
 190 static void *route_set_metric_compile(const char *arg)
 191 {
 192         int len;
 193         const char *pnt;
 194         int type;
 195         long metric;
 196         char *endptr = NULL;
 197         struct rip_metric_modifier *mod;
 198
 199         len = strlen(arg);
 200         pnt = arg;
 201
 202         if (len == 0)
 203                 return NULL;
 204
 205         /* Examine first character. */
 206         if (arg[0] == '+') {
 207                 type = metric_increment;
 208                 pnt++;
 209         } else if (arg[0] == '-') {
 210                 type = metric_decrement;
 211                 pnt++;
 212         } else
 213                 type = metric_absolute;
 214
 215         /* Check beginning with digit string. */
 216         if (*pnt < '0' || *pnt > '9')
 217                 return NULL;
 218
 219         /* Convert string to integer. */
 220         metric = strtol(pnt, &endptr, 10);
 221
 222         if (metric == LONG_MAX || *endptr != '\0')
 223                 return NULL;
 224         /* Commented out by Hasso Tepper, to avoid problems in vtysh. */
 225         /* if (metric < 0 || metric > RIPNG_METRIC_INFINITY) */
 226         if (metric < 0)
 227                 return NULL;
 228
 229         mod = XMALLOC(MTYPE_ROUTE_MAP_COMPILED,
 230                       sizeof(struct rip_metric_modifier));
 231         mod->type = type;
 232         mod->metric = metric;
 233
 234         return mod;
 235 }
 236
 237 /* Free route map's compiled `set metric' value. */
 238 static void route_set_metric_free(void *rule)
 239 {
 240         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 241 }
 242
 243 static struct route_map_rule_cmd route_set_metric_cmd = {
 244         "metric", route_set_metric, route_set_metric_compile,
 245         route_set_metric_free,
 246 };
 247
 248 /* `set ipv6 next-hop local IP_ADDRESS' */
 249
 250 /* Set nexthop to object.  ojbect must be pointer to struct attr. */
 251 static route_map_result_t route_set_ipv6_nexthop_local(void *rule,
 252                                                        struct prefix *prefix,
 253                                                        route_map_object_t type,
 254                                                        void *object)
 255 {
 256         struct in6_addr *address;
 257         struct ripng_info *rinfo;
 258
 259         if (type == RMAP_RIPNG) {
 260                 /* Fetch routemap's rule information. */
 261                 address = rule;
 262                 rinfo = object;
 263
 264                 /* Set next hop value. */
 265                 rinfo->nexthop_out = *address;
 266         }
 267
 268         return RMAP_OKAY;
 269 }
 270
 271 /* Route map `ipv6 nexthop local' compile function.  Given string is converted
 272    to struct in6_addr structure. */
 273 static void *route_set_ipv6_nexthop_local_compile(const char *arg)
 274 {
 275         int ret;
 276         struct in6_addr *address;
 277
 278         address = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(struct in6_addr));
 279
 280         ret = inet_pton(AF_INET6, arg, address);
 281
 282         if (ret == 0) {
 283                 XFREE(MTYPE_ROUTE_MAP_COMPILED, address);
 284                 return NULL;
 285         }
 286
 287         return address;
 288 }
 289
 290 /* Free route map's compiled `ipv6 nexthop local' value. */
 291 static void route_set_ipv6_nexthop_local_free(void *rule)
 292 {
 293         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 294 }
 295
 296 /* Route map commands for ipv6 nexthop local set. */
 297 static struct route_map_rule_cmd route_set_ipv6_nexthop_local_cmd = {
 298         "ipv6 next-hop local", route_set_ipv6_nexthop_local,
 299         route_set_ipv6_nexthop_local_compile,
 300         route_set_ipv6_nexthop_local_free};
 301
 302 /* `set tag TAG' */
 303
 304 /* Set tag to object.  ojbect must be pointer to struct attr. */
 305 static route_map_result_t route_set_tag(void *rule, struct prefix *prefix,
 306                                         route_map_object_t type, void *object)
 307 {
 308         route_tag_t *tag;
 309         struct ripng_info *rinfo;
 310
 311         if (type == RMAP_RIPNG) {
 312                 /* Fetch routemap's rule information. */
 313                 tag = rule;
 314                 rinfo = object;
 315
 316                 /* Set next hop value. */
 317                 rinfo->tag_out = *tag;
 318         }
 319
 320         return RMAP_OKAY;
 321 }
 322
 323 /* Route map commands for tag set. */
 324 static struct route_map_rule_cmd route_set_tag_cmd = {
 325         "tag", route_set_tag, route_map_rule_tag_compile,
 326         route_map_rule_tag_free};
 327
 328 #define MATCH_STR "Match values from routing table\n"
 329 #define SET_STR "Set values in destination routing protocol\n"
 330
 331 void ripng_route_map_reset()
 332 {
 333         /* XXX ??? */
 334         ;
 335 }
 336
 337 void ripng_route_map_init()
 338 {
 339         route_map_init();
 340
 341         route_map_match_interface_hook(generic_match_add);
 342         route_map_no_match_interface_hook(generic_match_delete);
 343
 344         route_map_match_metric_hook(generic_match_add);
 345         route_map_no_match_metric_hook(generic_match_delete);
 346
 347         route_map_match_tag_hook(generic_match_add);
 348         route_map_no_match_tag_hook(generic_match_delete);
 349
 350         route_map_set_ipv6_nexthop_local_hook(generic_set_add);
 351         route_map_no_set_ipv6_nexthop_local_hook(generic_set_delete);
 352
 353         route_map_set_metric_hook(generic_set_add);
 354         route_map_no_set_metric_hook(generic_set_delete);
 355
 356         route_map_set_tag_hook(generic_set_add);
 357         route_map_no_set_tag_hook(generic_set_delete);
 358
 359         route_map_install_match(&route_match_metric_cmd);
 360         route_map_install_match(&route_match_interface_cmd);
 361         route_map_install_match(&route_match_tag_cmd);
 362         route_map_install_set(&route_set_metric_cmd);
 363         route_map_install_set(&route_set_ipv6_nexthop_local_cmd);
 364         route_map_install_set(&route_set_tag_cmd);
 365 }