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         u_int8_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, struct prefix *prefix,
  42                                              route_map_object_t type,
  43                                              void *object)
  44 {
  45         u_int32_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         u_int32_t *metric;
  64
  65         metric = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(u_int32_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 route_map_result_t route_match_interface(void *rule,
  89                                                 struct prefix *prefix,
  90                                                 route_map_object_t type,
  91                                                 void *object)
  92 {
  93         struct ripng_info *rinfo;
  94         struct interface *ifp;
  95         char *ifname;
  96
  97         if (type == RMAP_RIPNG) {
  98                 ifname = rule;
  99                 ifp = if_lookup_by_name(ifname, VRF_DEFAULT);
 100
 101                 if (!ifp)
 102                         return RMAP_NOMATCH;
 103
 104                 rinfo = object;
 105
 106                 if (rinfo->ifindex == ifp->ifindex)
 107                         return RMAP_MATCH;
 108                 else
 109                         return RMAP_NOMATCH;
 110         }
 111         return RMAP_NOMATCH;
 112 }
 113
 114 /* Route map `match interface' match statement. `arg' is IFNAME value */
 115 static void *route_match_interface_compile(const char *arg)
 116 {
 117         return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
 118 }
 119
 120 static void route_match_interface_free(void *rule)
 121 {
 122         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 123 }
 124
 125 static struct route_map_rule_cmd route_match_interface_cmd = {
 126         "interface", route_match_interface, route_match_interface_compile,
 127         route_match_interface_free};
 128
 129 /* `match tag TAG' */
 130 /* Match function return 1 if match is success else return zero. */
 131 static route_map_result_t route_match_tag(void *rule, struct prefix *prefix,
 132                                           route_map_object_t type, void *object)
 133 {
 134         route_tag_t *tag;
 135         struct ripng_info *rinfo;
 136         route_tag_t rinfo_tag;
 137
 138         if (type == RMAP_RIPNG) {
 139                 tag = rule;
 140                 rinfo = object;
 141
 142                 /* The information stored by rinfo is host ordered. */
 143                 rinfo_tag = rinfo->tag;
 144                 if (rinfo_tag == *tag)
 145                         return RMAP_MATCH;
 146                 else
 147                         return RMAP_NOMATCH;
 148         }
 149         return RMAP_NOMATCH;
 150 }
 151
 152 static struct route_map_rule_cmd route_match_tag_cmd = {
 153         "tag", route_match_tag, route_map_rule_tag_compile,
 154         route_map_rule_tag_free,
 155 };
 156
 157 /* `set metric METRIC' */
 158
 159 /* Set metric to attribute. */
 160 static route_map_result_t route_set_metric(void *rule, struct prefix *prefix,
 161                                            route_map_object_t type,
 162                                            void *object)
 163 {
 164         if (type == RMAP_RIPNG) {
 165                 struct rip_metric_modifier *mod;
 166                 struct ripng_info *rinfo;
 167
 168                 mod = rule;
 169                 rinfo = object;
 170
 171                 if (!mod->used)
 172                         return RMAP_OKAY;
 173
 174                 if (mod->type == metric_increment)
 175                         rinfo->metric_out += mod->metric;
 176                 else if (mod->type == metric_decrement)
 177                         rinfo->metric_out -= mod->metric;
 178                 else if (mod->type == metric_absolute)
 179                         rinfo->metric_out = mod->metric;
 180
 181                 if (rinfo->metric_out < 1)
 182                         rinfo->metric_out = 1;
 183                 if (rinfo->metric_out > RIPNG_METRIC_INFINITY)
 184                         rinfo->metric_out = RIPNG_METRIC_INFINITY;
 185
 186                 rinfo->metric_set = 1;
 187         }
 188         return RMAP_OKAY;
 189 }
 190
 191 /* set metric compilation. */
 192 static void *route_set_metric_compile(const char *arg)
 193 {
 194         int len;
 195         const char *pnt;
 196         long metric;
 197         char *endptr = NULL;
 198         struct rip_metric_modifier *mod;
 199
 200         len = strlen(arg);
 201         pnt = arg;
 202
 203         mod = XMALLOC(MTYPE_ROUTE_MAP_COMPILED,
 204                       sizeof(struct rip_metric_modifier));
 205         mod->used = false;
 206
 207         if (len == 0)
 208                 return mod;
 209
 210         /* Examine first character. */
 211         if (arg[0] == '+') {
 212                 mod->type = metric_increment;
 213                 pnt++;
 214         } else if (arg[0] == '-') {
 215                 mod->type = metric_decrement;
 216                 pnt++;
 217         } else
 218                 mod->type = metric_absolute;
 219
 220         /* Check beginning with digit string. */
 221         if (*pnt < '0' || *pnt > '9')
 222                 return mod;
 223
 224         /* Convert string to integer. */
 225         metric = strtol(pnt, &endptr, 10);
 226
 227         if (*endptr != '\0' || metric < 0)
 228                 return mod;
 229
 230         if (metric > RIPNG_METRIC_INFINITY) {
 231                 zlog_info("%s: Metric specified: %ld is being converted into METRIC_INFINITY",
 232                           __PRETTY_FUNCTION__,
 233                           metric);
 234                 mod->metric = RIPNG_METRIC_INFINITY;
 235         } else
 236                 mod->metric = metric;
 237
 238         mod->used = true;
 239         return mod;
 240 }
 241
 242 /* Free route map's compiled `set metric' value. */
 243 static void route_set_metric_free(void *rule)
 244 {
 245         XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
 246 }
 247
 248 static struct route_map_rule_cmd route_set_metric_cmd = {
 249         "metric", route_set_metric, route_set_metric_compile,
 250         route_set_metric_free,
 251 };
 252
 253 /* `set ipv6 next-hop local IP_ADDRESS' */
 254
 255 /* Set nexthop to object.  ojbect must be pointer to struct attr. */
 256 static route_map_result_t route_set_ipv6_nexthop_local(void *rule,
 257                                                        struct prefix *prefix,
 258                                                        route_map_object_t type,
 259                                                        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 route_map_result_t route_set_tag(void *rule, struct prefix *prefix,
 311                                         route_map_object_t type, void *object)
 312 {
 313         route_tag_t *tag;
 314         struct ripng_info *rinfo;
 315
 316         if (type == RMAP_RIPNG) {
 317                 /* Fetch routemap's rule information. */
 318                 tag = rule;
 319                 rinfo = object;
 320
 321                 /* Set next hop value. */
 322                 rinfo->tag_out = *tag;
 323         }
 324
 325         return RMAP_OKAY;
 326 }
 327
 328 /* Route map commands for tag set. */
 329 static struct route_map_rule_cmd route_set_tag_cmd = {
 330         "tag", route_set_tag, route_map_rule_tag_compile,
 331         route_map_rule_tag_free};
 332
 333 #define MATCH_STR "Match values from routing table\n"
 334 #define SET_STR "Set values in destination routing protocol\n"
 335
 336 void ripng_route_map_reset()
 337 {
 338         /* XXX ??? */
 339         ;
 340 }
 341
 342 void ripng_route_map_init()
 343 {
 344         route_map_init();
 345
 346         route_map_match_interface_hook(generic_match_add);
 347         route_map_no_match_interface_hook(generic_match_delete);
 348
 349         route_map_match_metric_hook(generic_match_add);
 350         route_map_no_match_metric_hook(generic_match_delete);
 351
 352         route_map_match_tag_hook(generic_match_add);
 353         route_map_no_match_tag_hook(generic_match_delete);
 354
 355         route_map_set_ipv6_nexthop_local_hook(generic_set_add);
 356         route_map_no_set_ipv6_nexthop_local_hook(generic_set_delete);
 357
 358         route_map_set_metric_hook(generic_set_add);
 359         route_map_no_set_metric_hook(generic_set_delete);
 360
 361         route_map_set_tag_hook(generic_set_add);
 362         route_map_no_set_tag_hook(generic_set_delete);
 363
 364         route_map_install_match(&route_match_metric_cmd);
 365         route_map_install_match(&route_match_interface_cmd);
 366         route_map_install_match(&route_match_tag_cmd);
 367         route_map_install_set(&route_set_metric_cmd);
 368         route_map_install_set(&route_set_ipv6_nexthop_local_cmd);
 369         route_map_install_set(&route_set_tag_cmd);
 370 }