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 struct route_map_rule_cmd route_match_metric_cmd = {
  83         "metric", route_match_metric, route_match_metric_compile,
  84         route_match_metric_free};
  85
  86 /* `match interface IFNAME' */
  87 /* Match function return 1 if match is success else return zero. */
  88 static enum route_map_cmd_result_t
  89 route_match_interface(void *rule, const struct prefix *prefix,
  90                       route_map_object_t type, void *object)
  91 {
  92         struct ripng_info *rinfo;
  93         struct interface *ifp;
  94         char *ifname;
  95
  96         if (type == RMAP_RIPNG) {
  97                 ifname = rule;
  98                 ifp = if_lookup_by_name(ifname, VRF_DEFAULT);
  99
 100                 if (!ifp)
 101                         return RMAP_NOMATCH;
 102
 103                 rinfo = object;
 104
 105                 if (rinfo->ifindex == ifp->ifindex)
 106                         return RMAP_MATCH;
 107                 else
 108                         return RMAP_NOMATCH;
 109         }
 110         return RMAP_NOMATCH;
 111 }
 112
 113 /* Route map `match interface' match statement. `arg' is IFNAME value */
 114 static void *route_match_interface_compile(const char *arg)
 115 {
 116         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 117 }
 118
 119 static void route_match_interface_free(void *rule)
 120 {
 121         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 122 }
 123
 124 static struct route_map_rule_cmd route_match_interface_cmd = {
 125         "interface", route_match_interface, route_match_interface_compile,
 126         route_match_interface_free};
 127
 128 /* `match tag TAG' */
 129 /* Match function return 1 if match is success else return zero. */
 130 static enum route_map_cmd_result_t route_match_tag(void *rule,
 131                                                    const struct prefix *prefix,
 132                                                    route_map_object_t type,
 133                                                    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 enum route_map_cmd_result_t
 162 route_set_metric(void *rule, const struct prefix *prefix,
 163                  route_map_object_t type, 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->used)
 173                         return RMAP_OKAY;
 174
 175                 if (mod->type == metric_increment)
 176                         rinfo->metric_out += mod->metric;
 177                 else if (mod->type == metric_decrement)
 178                         rinfo->metric_out -= mod->metric;
 179                 else if (mod->type == metric_absolute)
 180                         rinfo->metric_out = mod->metric;
 181
 182                 if (rinfo->metric_out < 1)
 183                         rinfo->metric_out = 1;
 184                 if (rinfo->metric_out > RIPNG_METRIC_INFINITY)
 185                         rinfo->metric_out = RIPNG_METRIC_INFINITY;
 186
 187                 rinfo->metric_set = 1;
 188         }
 189         return RMAP_OKAY;
 190 }
 191
 192 /* set metric compilation. */
 193 static void *route_set_metric_compile(const char *arg)
 194 {
 195         int len;
 196         const char *pnt;
 197         long metric;
 198         char *endptr = NULL;
 199         struct rip_metric_modifier *mod;
 200
 201         len = strlen(arg);
 202         pnt = arg;
 203
 204         mod = XMALLOC(MTYPE_ROUTE_MAP_COMPILED,
 205                       sizeof(struct rip_metric_modifier));
 206         mod->used = false;
 207
 208         if (len == 0)
 209                 return mod;
 210
 211         /* Examine first character. */
 212         if (arg[0] == '+') {
 213                 mod->type = metric_increment;
 214                 pnt++;
 215         } else if (arg[0] == '-') {
 216                 mod->type = metric_decrement;
 217                 pnt++;
 218         } else
 219                 mod->type = metric_absolute;
 220
 221         /* Check beginning with digit string. */
 222         if (*pnt < '0' || *pnt > '9')
 223                 return mod;
 224
 225         /* Convert string to integer. */
 226         metric = strtol(pnt, &endptr, 10);
 227
 228         if (*endptr != '\0' || metric < 0)
 229                 return mod;
 230
 231         if (metric > RIPNG_METRIC_INFINITY) {
 232                 zlog_info("%s: Metric specified: %ld is being converted into METRIC_INFINITY",
 233                           __PRETTY_FUNCTION__,
 234                           metric);
 235                 mod->metric = RIPNG_METRIC_INFINITY;
 236         } else
 237                 mod->metric = metric;
 238
 239         mod->used = true;
 240         return mod;
 241 }
 242
 243 /* Free route map's compiled `set metric' value. */
 244 static void route_set_metric_free(void *rule)
 245 {
 246         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 247 }
 248
 249 static struct route_map_rule_cmd route_set_metric_cmd = {
 250         "metric", route_set_metric, route_set_metric_compile,
 251         route_set_metric_free,
 252 };
 253
 254 /* `set ipv6 next-hop local IP_ADDRESS' */
 255
 256 /* Set nexthop to object.  ojbect must be pointer to struct attr. */
 257 static enum route_map_cmd_result_t
 258 route_set_ipv6_nexthop_local(void *rule, const struct prefix *p,
 259                              route_map_object_t type, void *object)
 260 {
 261         struct in6_addr *address;
 262         struct ripng_info *rinfo;
 263
 264         if (type == RMAP_RIPNG) {
 265                 /* Fetch routemap's rule information. */
 266                 address = rule;
 267                 rinfo = object;
 268
 269                 /* Set next hop value. */
 270                 rinfo->nexthop_out = *address;
 271         }
 272
 273         return RMAP_OKAY;
 274 }
 275
 276 /* Route map `ipv6 nexthop local' compile function.  Given string is converted
 277    to struct in6_addr structure. */
 278 static void *route_set_ipv6_nexthop_local_compile(const char *arg)
 279 {
 280         int ret;
 281         struct in6_addr *address;
 282
 283         address = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(struct in6_addr));
 284
 285         ret = inet_pton(AF_INET6, arg, address);
 286
 287         if (ret == 0) {
 288                 XFREE(MTYPE_ROUTE_MAP_COMPILED, address);
 289                 return NULL;
 290         }
 291
 292         return address;
 293 }
 294
 295 /* Free route map's compiled `ipv6 nexthop local' value. */
 296 static void route_set_ipv6_nexthop_local_free(void *rule)
 297 {
 298         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 299 }
 300
 301 /* Route map commands for ipv6 nexthop local set. */
 302 static struct route_map_rule_cmd route_set_ipv6_nexthop_local_cmd = {
 303         "ipv6 next-hop local", route_set_ipv6_nexthop_local,
 304         route_set_ipv6_nexthop_local_compile,
 305         route_set_ipv6_nexthop_local_free};
 306
 307 /* `set tag TAG' */
 308
 309 /* Set tag to object.  ojbect must be pointer to struct attr. */
 310 static enum route_map_cmd_result_t
 311 route_set_tag(void *rule, const struct prefix *prefix, route_map_object_t type,
 312               void *object)
 313 {
 314         route_tag_t *tag;
 315         struct ripng_info *rinfo;
 316
 317         if (type == RMAP_RIPNG) {
 318                 /* Fetch routemap's rule information. */
 319                 tag = rule;
 320                 rinfo = object;
 321
 322                 /* Set next hop value. */
 323                 rinfo->tag_out = *tag;
 324         }
 325
 326         return RMAP_OKAY;
 327 }
 328
 329 /* Route map commands for tag set. */
 330 static struct route_map_rule_cmd route_set_tag_cmd = {
 331         "tag", route_set_tag, route_map_rule_tag_compile,
 332         route_map_rule_tag_free};
 333
 334 #define MATCH_STR "Match values from routing table\n"
 335 #define SET_STR "Set values in destination routing protocol\n"
 336
 337 void ripng_route_map_init(void)
 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 }