zebra, lib: fix the ZEBRA_INTERFACE_VRF_UPDATE zapi message

[mirror_frr.git] / lib / routemap.c

/* Route map function.
 * Copyright (C) 1998, 1999 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#include "linklist.h"
#include "memory.h"
#include "vector.h"
#include "prefix.h"
#include "vty.h"
#include "routemap.h"
#include "command.h"
#include "log.h"
#include "hash.h"
#include "libfrr.h"
#include "lib_errors.h"

DEFINE_MTYPE_STATIC(LIB, ROUTE_MAP, "Route map")
DEFINE_MTYPE(LIB, ROUTE_MAP_NAME, "Route map name")
DEFINE_MTYPE_STATIC(LIB, ROUTE_MAP_INDEX, "Route map index")
DEFINE_MTYPE(LIB, ROUTE_MAP_RULE, "Route map rule")
DEFINE_MTYPE_STATIC(LIB, ROUTE_MAP_RULE_STR, "Route map rule str")
DEFINE_MTYPE(LIB, ROUTE_MAP_COMPILED, "Route map compiled")
DEFINE_MTYPE_STATIC(LIB, ROUTE_MAP_DEP, "Route map dependency")

DEFINE_QOBJ_TYPE(route_map_index)
DEFINE_QOBJ_TYPE(route_map)

/* Vector for route match rules. */
static vector route_match_vec;

/* Vector for route set rules. */
static vector route_set_vec;

struct route_map_match_set_hooks {
        /* match interface */
        int (*match_interface)(struct vty *vty, struct route_map_index *index,
                               const char *command, const char *arg,
                               route_map_event_t type);

        /* no match interface */
        int (*no_match_interface)(struct vty *vty,
                                  struct route_map_index *index,
                                  const char *command, const char *arg,
                                  route_map_event_t type);

        /* match ip address */
        int (*match_ip_address)(struct vty *vty, struct route_map_index *index,
                                const char *command, const char *arg,
                                route_map_event_t type);

        /* no match ip address */
        int (*no_match_ip_address)(struct vty *vty,
                                   struct route_map_index *index,
                                   const char *command, const char *arg,
                                   route_map_event_t type);

        /* match ip address prefix list */
        int (*match_ip_address_prefix_list)(struct vty *vty,
                                            struct route_map_index *index,
                                            const char *command,
                                            const char *arg,
                                            route_map_event_t type);

        /* no match ip address prefix list */
        int (*no_match_ip_address_prefix_list)(struct vty *vty,
                                               struct route_map_index *index,
                                               const char *command,
                                               const char *arg,
                                               route_map_event_t type);

        /* match ip next hop */
        int (*match_ip_next_hop)(struct vty *vty, struct route_map_index *index,
                                 const char *command, const char *arg,
                                 route_map_event_t type);

        /* no match ip next hop */
        int (*no_match_ip_next_hop)(struct vty *vty,
                                    struct route_map_index *index,
                                    const char *command, const char *arg,
                                    route_map_event_t type);

        /* match ip next hop prefix list */
        int (*match_ip_next_hop_prefix_list)(struct vty *vty,
                                             struct route_map_index *index,
                                             const char *command,
                                             const char *arg,
                                             route_map_event_t type);

        /* no match ip next hop prefix list */
        int (*no_match_ip_next_hop_prefix_list)(struct vty *vty,
                                                struct route_map_index *index,
                                                const char *command,
                                                const char *arg,
                                                route_map_event_t type);

        /* match ip next hop type */
        int (*match_ip_next_hop_type)(struct vty *vty,
                                             struct route_map_index *index,
                                             const char *command,
                                             const char *arg,
                                             route_map_event_t type);

        /* no match ip next hop type */
        int (*no_match_ip_next_hop_type)(struct vty *vty,
                                                struct route_map_index *index,
                                                const char *command,
                                                const char *arg,
                                                route_map_event_t type);

        /* match ipv6 address */
        int (*match_ipv6_address)(struct vty *vty,
                                  struct route_map_index *index,
                                  const char *command, const char *arg,
                                  route_map_event_t type);

        /* no match ipv6 address */
        int (*no_match_ipv6_address)(struct vty *vty,
                                     struct route_map_index *index,
                                     const char *command, const char *arg,
                                     route_map_event_t type);


        /* match ipv6 address prefix list */
        int (*match_ipv6_address_prefix_list)(struct vty *vty,
                                              struct route_map_index *index,
                                              const char *command,
                                              const char *arg,
                                              route_map_event_t type);

        /* no match ipv6 address prefix list */
        int (*no_match_ipv6_address_prefix_list)(struct vty *vty,
                                                 struct route_map_index *index,
                                                 const char *command,
                                                 const char *arg,
                                                 route_map_event_t type);

        /* match ipv6 next-hop type */
        int (*match_ipv6_next_hop_type)(struct vty *vty,
                                              struct route_map_index *index,
                                              const char *command,
                                              const char *arg,
                                              route_map_event_t type);

        /* no match ipv6next-hop type */
        int (*no_match_ipv6_next_hop_type)(struct vty *vty,
                                           struct route_map_index *index,
                                           const char *command, const char *arg,
                                           route_map_event_t type);

        /* match metric */
        int (*match_metric)(struct vty *vty, struct route_map_index *index,
                            const char *command, const char *arg,
                            route_map_event_t type);

        /* no match metric */
        int (*no_match_metric)(struct vty *vty, struct route_map_index *index,
                               const char *command, const char *arg,
                               route_map_event_t type);

        /* match tag */
        int (*match_tag)(struct vty *vty, struct route_map_index *index,
                         const char *command, const char *arg,
                         route_map_event_t type);

        /* no match tag */
        int (*no_match_tag)(struct vty *vty, struct route_map_index *index,
                            const char *command, const char *arg,
                            route_map_event_t type);

        /* set ip nexthop */
        int (*set_ip_nexthop)(struct vty *vty, struct route_map_index *index,
                              const char *command, const char *arg);

        /* no set ip nexthop */
        int (*no_set_ip_nexthop)(struct vty *vty, struct route_map_index *index,
                                 const char *command, const char *arg);

        /* set ipv6 nexthop local */
        int (*set_ipv6_nexthop_local)(struct vty *vty,
                                      struct route_map_index *index,
                                      const char *command, const char *arg);

        /* no set ipv6 nexthop local */
        int (*no_set_ipv6_nexthop_local)(struct vty *vty,
                                         struct route_map_index *index,
                                         const char *command, const char *arg);

        /* set metric */
        int (*set_metric)(struct vty *vty, struct route_map_index *index,
                          const char *command, const char *arg);

        /* no set metric */
        int (*no_set_metric)(struct vty *vty, struct route_map_index *index,
                             const char *command, const char *arg);

        /* set tag */
        int (*set_tag)(struct vty *vty, struct route_map_index *index,
                       const char *command, const char *arg);

        /* no set tag */
        int (*no_set_tag)(struct vty *vty, struct route_map_index *index,
                          const char *command, const char *arg);
};

struct route_map_match_set_hooks rmap_match_set_hook;

/* match interface */
void route_map_match_interface_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_interface = func;
}

/* no match interface */
void route_map_no_match_interface_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_interface = func;
}

/* match ip address */
void route_map_match_ip_address_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ip_address = func;
}

/* no match ip address */
void route_map_no_match_ip_address_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ip_address = func;
}

/* match ip address prefix list */
void route_map_match_ip_address_prefix_list_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ip_address_prefix_list = func;
}

/* no match ip address prefix list */
void route_map_no_match_ip_address_prefix_list_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ip_address_prefix_list = func;
}

/* match ip next hop */
void route_map_match_ip_next_hop_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ip_next_hop = func;
}

/* no match ip next hop */
void route_map_no_match_ip_next_hop_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ip_next_hop = func;
}

/* match ip next hop prefix list */
void route_map_match_ip_next_hop_prefix_list_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ip_next_hop_prefix_list = func;
}

/* no match ip next hop prefix list */
void route_map_no_match_ip_next_hop_prefix_list_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ip_next_hop_prefix_list = func;
}

/* match ip next hop type */
void route_map_match_ip_next_hop_type_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ip_next_hop_type = func;
}

/* no match ip next hop type */
void route_map_no_match_ip_next_hop_type_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ip_next_hop_type = func;
}

/* match ipv6 address */
void route_map_match_ipv6_address_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ipv6_address = func;
}

/* no match ipv6 address */
void route_map_no_match_ipv6_address_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ipv6_address = func;
}


/* match ipv6 address prefix list */
void route_map_match_ipv6_address_prefix_list_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ipv6_address_prefix_list = func;
}

/* no match ipv6 address prefix list */
void route_map_no_match_ipv6_address_prefix_list_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ipv6_address_prefix_list = func;
}

/* match ipv6 next-hop type */
void route_map_match_ipv6_next_hop_type_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_ipv6_next_hop_type = func;
}

/* no match ipv6 next-hop type */
void route_map_no_match_ipv6_next_hop_type_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_ipv6_next_hop_type = func;
}

/* match metric */
void route_map_match_metric_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.match_metric = func;
}

/* no match metric */
void route_map_no_match_metric_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_metric = func;
}

/* match tag */
void route_map_match_tag_hook(int (*func)(struct vty *vty,
                                          struct route_map_index *index,
                                          const char *command, const char *arg,
                                          route_map_event_t type))
{
        rmap_match_set_hook.match_tag = func;
}

/* no match tag */
void route_map_no_match_tag_hook(int (*func)(
        struct vty *vty, struct route_map_index *index, const char *command,
        const char *arg, route_map_event_t type))
{
        rmap_match_set_hook.no_match_tag = func;
}

/* set ip nexthop */
void route_map_set_ip_nexthop_hook(int (*func)(struct vty *vty,
                                               struct route_map_index *index,
                                               const char *command,
                                               const char *arg))
{
        rmap_match_set_hook.set_ip_nexthop = func;
}

/* no set ip nexthop */
void route_map_no_set_ip_nexthop_hook(int (*func)(struct vty *vty,
                                                  struct route_map_index *index,
                                                  const char *command,
                                                  const char *arg))
{
        rmap_match_set_hook.no_set_ip_nexthop = func;
}

/* set ipv6 nexthop local */
void route_map_set_ipv6_nexthop_local_hook(
        int (*func)(struct vty *vty, struct route_map_index *index,
                    const char *command, const char *arg))
{
        rmap_match_set_hook.set_ipv6_nexthop_local = func;
}

/* no set ipv6 nexthop local */
void route_map_no_set_ipv6_nexthop_local_hook(
        int (*func)(struct vty *vty, struct route_map_index *index,
                    const char *command, const char *arg))
{
        rmap_match_set_hook.no_set_ipv6_nexthop_local = func;
}

/* set metric */
void route_map_set_metric_hook(int (*func)(struct vty *vty,
                                           struct route_map_index *index,
                                           const char *command,
                                           const char *arg))
{
        rmap_match_set_hook.set_metric = func;
}

/* no set metric */
void route_map_no_set_metric_hook(int (*func)(struct vty *vty,
                                              struct route_map_index *index,
                                              const char *command,
                                              const char *arg))
{
        rmap_match_set_hook.no_set_metric = func;
}

/* set tag */
void route_map_set_tag_hook(int (*func)(struct vty *vty,
                                        struct route_map_index *index,
                                        const char *command, const char *arg))
{
        rmap_match_set_hook.set_tag = func;
}

/* no set tag */
void route_map_no_set_tag_hook(int (*func)(struct vty *vty,
                                           struct route_map_index *index,
                                           const char *command,
                                           const char *arg))
{
        rmap_match_set_hook.no_set_tag = func;
}

int generic_match_add(struct vty *vty, struct route_map_index *index,
                      const char *command, const char *arg,
                      route_map_event_t type)
{
        int ret;

        ret = route_map_add_match(index, command, arg);
        switch (ret) {
        case RMAP_COMPILE_SUCCESS:
                if (type != RMAP_EVENT_MATCH_ADDED) {
                        route_map_upd8_dependency(type, arg, index->map->name);
                }
                break;
        case RMAP_RULE_MISSING:
                vty_out(vty, "%% [%s] Can't find rule.\n", frr_protonameinst);
                return CMD_WARNING_CONFIG_FAILED;
                break;
        case RMAP_COMPILE_ERROR:
                vty_out(vty,
                        "%% [%s] Argument form is unsupported or malformed.\n",
                        frr_protonameinst);
                return CMD_WARNING_CONFIG_FAILED;
                break;
        }

        return CMD_SUCCESS;
}

int generic_match_delete(struct vty *vty, struct route_map_index *index,
                         const char *command, const char *arg,
                         route_map_event_t type)
{
        int ret;
        int retval = CMD_SUCCESS;
        char *dep_name = NULL;
        const char *tmpstr;
        char *rmap_name = NULL;

        if (type != RMAP_EVENT_MATCH_DELETED) {
                /* ignore the mundane, the types without any dependency */
                if (arg == NULL) {
                        if ((tmpstr = route_map_get_match_arg(index, command))
                            != NULL)
                                dep_name =
                                        XSTRDUP(MTYPE_ROUTE_MAP_RULE, tmpstr);
                } else {
                        dep_name = XSTRDUP(MTYPE_ROUTE_MAP_RULE, arg);
                }
                rmap_name = XSTRDUP(MTYPE_ROUTE_MAP_NAME, index->map->name);
        }

        ret = route_map_delete_match(index, command, dep_name);
        switch (ret) {
        case RMAP_RULE_MISSING:
                vty_out(vty, "%% [%s] Can't find rule.\n", frr_protonameinst);
                retval = CMD_WARNING_CONFIG_FAILED;
                break;
        case RMAP_COMPILE_ERROR:
                vty_out(vty,
                        "%% [%s] Argument form is unsupported or malformed.\n",
                        frr_protonameinst);
                retval = CMD_WARNING_CONFIG_FAILED;
                break;
        case RMAP_COMPILE_SUCCESS:
                if (type != RMAP_EVENT_MATCH_DELETED && dep_name)
                        route_map_upd8_dependency(type, dep_name, rmap_name);
                break;
        }

        if (dep_name)
                XFREE(MTYPE_ROUTE_MAP_RULE, dep_name);
        if (rmap_name)
                XFREE(MTYPE_ROUTE_MAP_NAME, rmap_name);

        return retval;
}

int generic_set_add(struct vty *vty, struct route_map_index *index,
                    const char *command, const char *arg)
{
        int ret;

        ret = route_map_add_set(index, command, arg);
        switch (ret) {
        case RMAP_RULE_MISSING:
                vty_out(vty, "%% [%s] Can't find rule.\n", frr_protonameinst);
                return CMD_WARNING_CONFIG_FAILED;
                break;
        case RMAP_COMPILE_ERROR:
                vty_out(vty,
                        "%% [%s] Argument form is unsupported or malformed.\n",
                        frr_protonameinst);
                return CMD_WARNING_CONFIG_FAILED;
                break;
        case RMAP_COMPILE_SUCCESS:
                break;
        }

        return CMD_SUCCESS;
}

int generic_set_delete(struct vty *vty, struct route_map_index *index,
                       const char *command, const char *arg)
{
        int ret;

        ret = route_map_delete_set(index, command, arg);
        switch (ret) {
        case RMAP_RULE_MISSING:
                vty_out(vty, "%% [%s] Can't find rule.\n", frr_protonameinst);
                return CMD_WARNING_CONFIG_FAILED;
                break;
        case RMAP_COMPILE_ERROR:
                vty_out(vty,
                        "%% [%s] Argument form is unsupported or malformed.\n",
                        frr_protonameinst);
                return CMD_WARNING_CONFIG_FAILED;
                break;
        case RMAP_COMPILE_SUCCESS:
                break;
        }

        return CMD_SUCCESS;
}


/* Route map rule. This rule has both `match' rule and `set' rule. */
struct route_map_rule {
        /* Rule type. */
        struct route_map_rule_cmd *cmd;

        /* For pretty printing. */
        char *rule_str;

        /* Pre-compiled match rule. */
        void *value;

        /* Linked list. */
        struct route_map_rule *next;
        struct route_map_rule *prev;
};

/* Making route map list. */
struct route_map_list {
        struct route_map *head;
        struct route_map *tail;

        void (*add_hook)(const char *);
        void (*delete_hook)(const char *);
        void (*event_hook)(route_map_event_t, const char *);
};

/* Master list of route map. */
static struct route_map_list route_map_master = {NULL, NULL, NULL, NULL, NULL};
struct hash *route_map_master_hash = NULL;

static unsigned int route_map_hash_key_make(void *p)
{
        const struct route_map *map = p;
        return string_hash_make(map->name);
}

static bool route_map_hash_cmp(const void *p1, const void *p2)
{
        const struct route_map *map1 = p1;
        const struct route_map *map2 = p2;

        if (map1->deleted == map2->deleted) {
                if (map1->name && map2->name) {
                        if (!strcmp(map1->name, map2->name)) {
                                return true;
                        }
                } else if (!map1->name && !map2->name) {
                        return true;
                }
        }

        return false;
}

enum route_map_upd8_type {
        ROUTE_MAP_ADD = 1,
        ROUTE_MAP_DEL,
};

/* all possible route-map dependency types */
enum route_map_dep_type {
        ROUTE_MAP_DEP_RMAP = 1,
        ROUTE_MAP_DEP_CLIST,
        ROUTE_MAP_DEP_ECLIST,
        ROUTE_MAP_DEP_LCLIST,
        ROUTE_MAP_DEP_PLIST,
        ROUTE_MAP_DEP_ASPATH,
        ROUTE_MAP_DEP_FILTER,
        ROUTE_MAP_DEP_MAX,
};

struct route_map_dep {
        char *dep_name;
        struct hash *dep_rmap_hash;
        struct hash *this_hash; /* ptr to the hash structure this is part of */
};

/* Hashes maintaining dependency between various sublists used by route maps */
struct hash *route_map_dep_hash[ROUTE_MAP_DEP_MAX];

static unsigned int route_map_dep_hash_make_key(void *p);
static void route_map_clear_all_references(char *rmap_name);
static void route_map_rule_delete(struct route_map_rule_list *,
                                  struct route_map_rule *);
static int rmap_debug = 0;

static void route_map_index_delete(struct route_map_index *, int);

/* New route map allocation. Please note route map's name must be
   specified. */
static struct route_map *route_map_new(const char *name)
{
        struct route_map *new;

        new = XCALLOC(MTYPE_ROUTE_MAP, sizeof(struct route_map));
        new->name = XSTRDUP(MTYPE_ROUTE_MAP_NAME, name);
        QOBJ_REG(new, route_map);
        return new;
}

/* Add new name to route_map. */
static struct route_map *route_map_add(const char *name)
{
        struct route_map *map;
        struct route_map_list *list;

        map = route_map_new(name);
        list = &route_map_master;

        /* Add map to the hash */
        hash_get(route_map_master_hash, map, hash_alloc_intern);

        /* Add new entry to the head of the list to match how it is added in the
         * hash table. This is to ensure that if the same route-map has been
         * created more than once and then marked for deletion (which can happen
         * if prior deletions haven't completed as BGP hasn't yet done the
         * route-map processing), the order of the entities is the same in both
         * the list and the hash table. Otherwise, since there is nothing to
         * distinguish between the two entries, the wrong entry could get freed.
         * TODO: This needs to be re-examined to handle it better - e.g., revive
         * a deleted entry if the route-map is created again.
         */
        map->prev = NULL;
        map->next = list->head;
        if (list->head)
                list->head->prev = map;
        list->head = map;
        if (!list->tail)
                list->tail = map;

        /* Execute hook. */
        if (route_map_master.add_hook) {
                (*route_map_master.add_hook)(name);
                route_map_notify_dependencies(name, RMAP_EVENT_CALL_ADDED);
        }
        return map;
}

/* this is supposed to be called post processing by
 * the delete hook function. Don't invoke delete_hook
 * again in this routine.
 */
static void route_map_free_map(struct route_map *map)
{
        struct route_map_list *list;
        struct route_map_index *index;

        if (map == NULL)
                return;

        while ((index = map->head) != NULL)
                route_map_index_delete(index, 0);

        list = &route_map_master;

        QOBJ_UNREG(map);

        if (map->next)
                map->next->prev = map->prev;
        else
                list->tail = map->prev;

        if (map->prev)
                map->prev->next = map->next;
        else
                list->head = map->next;

        hash_release(route_map_master_hash, map);
        XFREE(MTYPE_ROUTE_MAP_NAME, map->name);
        XFREE(MTYPE_ROUTE_MAP, map);
}

/* Route map delete from list. */
static void route_map_delete(struct route_map *map)
{
        struct route_map_index *index;
        char *name;

        while ((index = map->head) != NULL)
                route_map_index_delete(index, 0);

        name = map->name;
        map->head = NULL;

        /* Clear all dependencies */
        route_map_clear_all_references(name);
        map->deleted = true;
        /* Execute deletion hook. */
        if (route_map_master.delete_hook) {
                (*route_map_master.delete_hook)(name);
                route_map_notify_dependencies(name, RMAP_EVENT_CALL_DELETED);
        }

        if (!map->to_be_processed) {
                route_map_free_map(map);
        }
}

/* Lookup route map by route map name string. */
struct route_map *route_map_lookup_by_name(const char *name)
{
        struct route_map *map;
        struct route_map tmp_map;

        if (!name)
                return NULL;

        // map.deleted is 0 via memset
        memset(&tmp_map, 0, sizeof(struct route_map));
        tmp_map.name = XSTRDUP(MTYPE_ROUTE_MAP_NAME, name);
        map = hash_lookup(route_map_master_hash, &tmp_map);
        XFREE(MTYPE_ROUTE_MAP_NAME, tmp_map.name);
        return map;
}

/* Simple helper to warn if route-map does not exist. */
struct route_map *route_map_lookup_warn_noexist(struct vty *vty, const char *name)
{
        struct route_map *route_map = route_map_lookup_by_name(name);

        if (!route_map)
                if (vty_shell_serv(vty))
                        vty_out(vty, "The route-map '%s' does not exist.\n", name);

        return route_map;
}

int route_map_mark_updated(const char *name)
{
        struct route_map *map;
        int ret = -1;
        struct route_map tmp_map;

        if (!name)
                return (ret);

        map = route_map_lookup_by_name(name);

        /* If we did not find the routemap with deleted=false try again
         * with deleted=true
         */
        if (!map) {
                memset(&tmp_map, 0, sizeof(struct route_map));
                tmp_map.name = XSTRDUP(MTYPE_ROUTE_MAP_NAME, name);
                tmp_map.deleted = true;
                map = hash_lookup(route_map_master_hash, &tmp_map);
                XFREE(MTYPE_ROUTE_MAP_NAME, tmp_map.name);
        }

        if (map) {
                map->to_be_processed = true;
                ret = 0;
        }

        return (ret);
}

static int route_map_clear_updated(struct route_map *map)
{
        int ret = -1;

        if (map) {
                map->to_be_processed = false;
                if (map->deleted)
                        route_map_free_map(map);
        }

        return (ret);
}

/* Lookup route map.  If there isn't route map create one and return
   it. */
static struct route_map *route_map_get(const char *name)
{
        struct route_map *map;

        map = route_map_lookup_by_name(name);
        if (map == NULL)
                map = route_map_add(name);

        return map;
}

void route_map_walk_update_list(void (*route_map_update_fn)(char *name))
{
        struct route_map *node;
        struct route_map *nnode = NULL;

        for (node = route_map_master.head; node; node = nnode) {
                if (node->to_be_processed) {
                        /* DD: Should we add any thread yield code here */
                        route_map_update_fn(node->name);
                        nnode = node->next;
                        route_map_clear_updated(node);
                } else
                        nnode = node->next;
        }
}

/* Return route map's type string. */
static const char *route_map_type_str(enum route_map_type type)
{
        switch (type) {
        case RMAP_PERMIT:
                return "permit";
                break;
        case RMAP_DENY:
                return "deny";
                break;
        default:
                return "";
                break;
        }
}

static int route_map_empty(struct route_map *map)
{
        if (map->head == NULL && map->tail == NULL)
                return 1;
        else
                return 0;
}

/* show route-map */
static void vty_show_route_map_entry(struct vty *vty, struct route_map *map)
{
        struct route_map_index *index;
        struct route_map_rule *rule;

        vty_out(vty, "route-map: %s Invoked: %" PRIu64 "\n",
                map->name, map->applied);

        for (index = map->head; index; index = index->next) {
                vty_out(vty, " %s, sequence %d Invoked %" PRIu64 "\n",
                        route_map_type_str(index->type), index->pref,
                        index->applied);

                /* Description */
                if (index->description)
                        vty_out(vty, "  Description:\n    %s\n",
                                index->description);

                /* Match clauses */
                vty_out(vty, "  Match clauses:\n");
                for (rule = index->match_list.head; rule; rule = rule->next)
                        vty_out(vty, "    %s %s\n", rule->cmd->str,
                                rule->rule_str);

                vty_out(vty, "  Set clauses:\n");
                for (rule = index->set_list.head; rule; rule = rule->next)
                        vty_out(vty, "    %s %s\n", rule->cmd->str,
                                rule->rule_str);

                /* Call clause */
                vty_out(vty, "  Call clause:\n");
                if (index->nextrm)
                        vty_out(vty, "    Call %s\n", index->nextrm);

                /* Exit Policy */
                vty_out(vty, "  Action:\n");
                if (index->exitpolicy == RMAP_GOTO)
                        vty_out(vty, "    Goto %d\n", index->nextpref);
                else if (index->exitpolicy == RMAP_NEXT)
                        vty_out(vty, "    Continue to next entry\n");
                else if (index->exitpolicy == RMAP_EXIT)
                        vty_out(vty, "    Exit routemap\n");
        }
}

static int sort_route_map(const void **map1, const void **map2)
{
        const struct route_map *m1 = *map1;
        const struct route_map *m2 = *map2;

        return strcmp(m1->name, m2->name);
}

static int vty_show_route_map(struct vty *vty, const char *name)
{
        struct route_map *map;

        vty_out(vty, "%s:\n", frr_protonameinst);

        if (name) {
                map = route_map_lookup_by_name(name);

                if (map) {
                        vty_show_route_map_entry(vty, map);
                        return CMD_SUCCESS;
                } else {
                        vty_out(vty, "%s: 'route-map %s' not found\n",
                                frr_protonameinst, name);
                        return CMD_SUCCESS;
                }
        } else {

                struct list *maplist = list_new();
                struct listnode *ln;

                for (map = route_map_master.head; map; map = map->next)
                        listnode_add(maplist, map);

                list_sort(maplist, sort_route_map);

                for (ALL_LIST_ELEMENTS_RO(maplist, ln, map))
                        vty_show_route_map_entry(vty, map);

                list_delete(&maplist);
        }
        return CMD_SUCCESS;
}


/* New route map allocation. Please note route map's name must be
   specified. */
static struct route_map_index *route_map_index_new(void)
{
        struct route_map_index *new;

        new = XCALLOC(MTYPE_ROUTE_MAP_INDEX, sizeof(struct route_map_index));
        new->exitpolicy = RMAP_EXIT; /* Default to Cisco-style */
        QOBJ_REG(new, route_map_index);
        return new;
}

/* Free route map index. */
static void route_map_index_delete(struct route_map_index *index, int notify)
{
        struct route_map_rule *rule;

        QOBJ_UNREG(index);

        /* Free route match. */
        while ((rule = index->match_list.head) != NULL)
                route_map_rule_delete(&index->match_list, rule);

        /* Free route set. */
        while ((rule = index->set_list.head) != NULL)
                route_map_rule_delete(&index->set_list, rule);

        /* Remove index from route map list. */
        if (index->next)
                index->next->prev = index->prev;
        else
                index->map->tail = index->prev;

        if (index->prev)
                index->prev->next = index->next;
        else
                index->map->head = index->next;

        /* Free 'char *nextrm' if not NULL */
        if (index->nextrm)
                XFREE(MTYPE_ROUTE_MAP_NAME, index->nextrm);

        /* Execute event hook. */
        if (route_map_master.event_hook && notify) {
                (*route_map_master.event_hook)(RMAP_EVENT_INDEX_DELETED,
                                               index->map->name);
                route_map_notify_dependencies(index->map->name,
                                              RMAP_EVENT_CALL_ADDED);
        }
        XFREE(MTYPE_ROUTE_MAP_INDEX, index);
}

/* Lookup index from route map. */
static struct route_map_index *route_map_index_lookup(struct route_map *map,
                                                      enum route_map_type type,
                                                      int pref)
{
        struct route_map_index *index;

        for (index = map->head; index; index = index->next)
                if ((index->type == type || type == RMAP_ANY)
                    && index->pref == pref)
                        return index;
        return NULL;
}

/* Add new index to route map. */
static struct route_map_index *
route_map_index_add(struct route_map *map, enum route_map_type type, int pref)
{
        struct route_map_index *index;
        struct route_map_index *point;

        /* Allocate new route map inex. */
        index = route_map_index_new();
        index->map = map;
        index->type = type;
        index->pref = pref;

        /* Compare preference. */
        for (point = map->head; point; point = point->next)
                if (point->pref >= pref)
                        break;

        if (map->head == NULL) {
                map->head = map->tail = index;
        } else if (point == NULL) {
                index->prev = map->tail;
                map->tail->next = index;
                map->tail = index;
        } else if (point == map->head) {
                index->next = map->head;
                map->head->prev = index;
                map->head = index;
        } else {
                index->next = point;
                index->prev = point->prev;
                if (point->prev)
                        point->prev->next = index;
                point->prev = index;
        }

        /* Execute event hook. */
        if (route_map_master.event_hook) {
                (*route_map_master.event_hook)(RMAP_EVENT_INDEX_ADDED,
                                               map->name);
                route_map_notify_dependencies(map->name, RMAP_EVENT_CALL_ADDED);
        }
        return index;
}

/* Get route map index. */
static struct route_map_index *
route_map_index_get(struct route_map *map, enum route_map_type type, int pref)
{
        struct route_map_index *index;

        index = route_map_index_lookup(map, RMAP_ANY, pref);
        if (index && index->type != type) {
                /* Delete index from route map. */
                route_map_index_delete(index, 1);
                index = NULL;
        }
        if (index == NULL)
                index = route_map_index_add(map, type, pref);
        return index;
}

/* New route map rule */
static struct route_map_rule *route_map_rule_new(void)
{
        struct route_map_rule *new;

        new = XCALLOC(MTYPE_ROUTE_MAP_RULE, sizeof(struct route_map_rule));
        return new;
}

/* Install rule command to the match list. */
void route_map_install_match(struct route_map_rule_cmd *cmd)
{
        vector_set(route_match_vec, cmd);
}

/* Install rule command to the set list. */
void route_map_install_set(struct route_map_rule_cmd *cmd)
{
        vector_set(route_set_vec, cmd);
}

/* Lookup rule command from match list. */
static struct route_map_rule_cmd *route_map_lookup_match(const char *name)
{
        unsigned int i;
        struct route_map_rule_cmd *rule;

        for (i = 0; i < vector_active(route_match_vec); i++)
                if ((rule = vector_slot(route_match_vec, i)) != NULL)
                        if (strcmp(rule->str, name) == 0)
                                return rule;
        return NULL;
}

/* Lookup rule command from set list. */
static struct route_map_rule_cmd *route_map_lookup_set(const char *name)
{
        unsigned int i;
        struct route_map_rule_cmd *rule;

        for (i = 0; i < vector_active(route_set_vec); i++)
                if ((rule = vector_slot(route_set_vec, i)) != NULL)
                        if (strcmp(rule->str, name) == 0)
                                return rule;
        return NULL;
}

/* Add match and set rule to rule list. */
static void route_map_rule_add(struct route_map_rule_list *list,
                               struct route_map_rule *rule)
{
        rule->next = NULL;
        rule->prev = list->tail;
        if (list->tail)
                list->tail->next = rule;
        else
                list->head = rule;
        list->tail = rule;
}

/* Delete rule from rule list. */
static void route_map_rule_delete(struct route_map_rule_list *list,
                                  struct route_map_rule *rule)
{
        if (rule->cmd->func_free)
                (*rule->cmd->func_free)(rule->value);

        if (rule->rule_str)
                XFREE(MTYPE_ROUTE_MAP_RULE_STR, rule->rule_str);

        if (rule->next)
                rule->next->prev = rule->prev;
        else
                list->tail = rule->prev;
        if (rule->prev)
                rule->prev->next = rule->next;
        else
                list->head = rule->next;

        XFREE(MTYPE_ROUTE_MAP_RULE, rule);
}

/* strcmp wrapper function which don't crush even argument is NULL. */
static int rulecmp(const char *dst, const char *src)
{
        if (dst == NULL) {
                if (src == NULL)
                        return 0;
                else
                        return 1;
        } else {
                if (src == NULL)
                        return 1;
                else
                        return strcmp(dst, src);
        }
        return 1;
}

/* Use this to return the already specified argument for this match. This is
 * useful to get the specified argument with a route map match rule when the
 * rule is being deleted and the argument is not provided.
 */
const char *route_map_get_match_arg(struct route_map_index *index,
                                    const char *match_name)
{
        struct route_map_rule *rule;
        struct route_map_rule_cmd *cmd;

        /* First lookup rule for add match statement. */
        cmd = route_map_lookup_match(match_name);
        if (cmd == NULL)
                return NULL;

        for (rule = index->match_list.head; rule; rule = rule->next)
                if (rule->cmd == cmd && rule->rule_str != NULL)
                        return (rule->rule_str);

        return (NULL);
}

/* Add match statement to route map. */
int route_map_add_match(struct route_map_index *index, const char *match_name,
                        const char *match_arg)
{
        struct route_map_rule *rule;
        struct route_map_rule *next;
        struct route_map_rule_cmd *cmd;
        void *compile;
        int replaced = 0;

        /* First lookup rule for add match statement. */
        cmd = route_map_lookup_match(match_name);
        if (cmd == NULL)
                return RMAP_RULE_MISSING;

        /* Next call compile function for this match statement. */
        if (cmd->func_compile) {
                compile = (*cmd->func_compile)(match_arg);
                if (compile == NULL)
                        return RMAP_COMPILE_ERROR;
        } else
                compile = NULL;

        /* If argument is completely same ignore it. */
        for (rule = index->match_list.head; rule; rule = next) {
                next = rule->next;
                if (rule->cmd == cmd) {
                        route_map_rule_delete(&index->match_list, rule);
                        replaced = 1;
                }
        }

        /* Add new route map match rule. */
        rule = route_map_rule_new();
        rule->cmd = cmd;
        rule->value = compile;
        if (match_arg)
                rule->rule_str = XSTRDUP(MTYPE_ROUTE_MAP_RULE_STR, match_arg);
        else
                rule->rule_str = NULL;

        /* Add new route match rule to linked list. */
        route_map_rule_add(&index->match_list, rule);

        /* Execute event hook. */
        if (route_map_master.event_hook) {
                (*route_map_master.event_hook)(
                        replaced ? RMAP_EVENT_MATCH_REPLACED
                                 : RMAP_EVENT_MATCH_ADDED,
                        index->map->name);
                route_map_notify_dependencies(index->map->name,
                                              RMAP_EVENT_CALL_ADDED);
        }

        return RMAP_COMPILE_SUCCESS;
}

/* Delete specified route match rule. */
int route_map_delete_match(struct route_map_index *index,
                           const char *match_name, const char *match_arg)
{
        struct route_map_rule *rule;
        struct route_map_rule_cmd *cmd;

        cmd = route_map_lookup_match(match_name);
        if (cmd == NULL)
                return 1;

        for (rule = index->match_list.head; rule; rule = rule->next)
                if (rule->cmd == cmd && (rulecmp(rule->rule_str, match_arg) == 0
                                         || match_arg == NULL)) {
                        route_map_rule_delete(&index->match_list, rule);
                        /* Execute event hook. */
                        if (route_map_master.event_hook) {
                                (*route_map_master.event_hook)(
                                        RMAP_EVENT_MATCH_DELETED,
                                        index->map->name);
                                route_map_notify_dependencies(
                                        index->map->name,
                                        RMAP_EVENT_CALL_ADDED);
                        }
                        return 0;
                }
        /* Can't find matched rule. */
        return 1;
}

/* Add route-map set statement to the route map. */
int route_map_add_set(struct route_map_index *index, const char *set_name,
                      const char *set_arg)
{
        struct route_map_rule *rule;
        struct route_map_rule *next;
        struct route_map_rule_cmd *cmd;
        void *compile;
        int replaced = 0;

        cmd = route_map_lookup_set(set_name);
        if (cmd == NULL)
                return RMAP_RULE_MISSING;

        /* Next call compile function for this match statement. */
        if (cmd->func_compile) {
                compile = (*cmd->func_compile)(set_arg);
                if (compile == NULL)
                        return RMAP_COMPILE_ERROR;
        } else
                compile = NULL;

        /* Add by WJL. if old set command of same kind exist, delete it first
           to ensure only one set command of same kind exist under a
           route_map_index. */
        for (rule = index->set_list.head; rule; rule = next) {
                next = rule->next;
                if (rule->cmd == cmd) {
                        route_map_rule_delete(&index->set_list, rule);
                        replaced = 1;
                }
        }

        /* Add new route map match rule. */
        rule = route_map_rule_new();
        rule->cmd = cmd;
        rule->value = compile;
        if (set_arg)
                rule->rule_str = XSTRDUP(MTYPE_ROUTE_MAP_RULE_STR, set_arg);
        else
                rule->rule_str = NULL;

        /* Add new route match rule to linked list. */
        route_map_rule_add(&index->set_list, rule);

        /* Execute event hook. */
        if (route_map_master.event_hook) {
                (*route_map_master.event_hook)(replaced
                                                       ? RMAP_EVENT_SET_REPLACED
                                                       : RMAP_EVENT_SET_ADDED,
                                               index->map->name);
                route_map_notify_dependencies(index->map->name,
                                              RMAP_EVENT_CALL_ADDED);
        }
        return RMAP_COMPILE_SUCCESS;
}

/* Delete route map set rule. */
int route_map_delete_set(struct route_map_index *index, const char *set_name,
                         const char *set_arg)
{
        struct route_map_rule *rule;
        struct route_map_rule_cmd *cmd;

        cmd = route_map_lookup_set(set_name);
        if (cmd == NULL)
                return 1;

        for (rule = index->set_list.head; rule; rule = rule->next)
                if ((rule->cmd == cmd) && (rulecmp(rule->rule_str, set_arg) == 0
                                           || set_arg == NULL)) {
                        route_map_rule_delete(&index->set_list, rule);
                        /* Execute event hook. */
                        if (route_map_master.event_hook) {
                                (*route_map_master.event_hook)(
                                        RMAP_EVENT_SET_DELETED,
                                        index->map->name);
                                route_map_notify_dependencies(
                                        index->map->name,
                                        RMAP_EVENT_CALL_ADDED);
                        }
                        return 0;
                }
        /* Can't find matched rule. */
        return 1;
}

/* Apply route map's each index to the object.

   The matrix for a route-map looks like this:
   (note, this includes the description for the "NEXT"
   and "GOTO" frobs now

              Match   |   No Match
                      |
    permit    action  |     cont
                      |
    ------------------+---------------
                      |
    deny      deny    |     cont
                      |

   action)
      -Apply Set statements, accept route
      -If Call statement is present jump to the specified route-map, if it
         denies the route we finish.
      -If NEXT is specified, goto NEXT statement
      -If GOTO is specified, goto the first clause where pref > nextpref
      -If nothing is specified, do as Cisco and finish
   deny)
      -Route is denied by route-map.
   cont)
      -Goto Next index

   If we get no matches after we've processed all updates, then the route
   is dropped too.

   Some notes on the new "CALL", "NEXT" and "GOTO"
     call WORD        - If this clause is matched, then the set statements
                        are executed and then we jump to route-map 'WORD'. If
                        this route-map denies the route, we finish, in other
   case we
                        do whatever the exit policy (EXIT, NEXT or GOTO) tells.
     on-match next    - If this clause is matched, then the set statements
                        are executed and then we drop through to the next clause
     on-match goto n  - If this clause is matched, then the set statments
                        are executed and then we goto the nth clause, or the
                        first clause greater than this. In order to ensure
                        route-maps *always* exit, you cannot jump backwards.
                        Sorry ;)

   We need to make sure our route-map processing matches the above
*/

static route_map_result_t
route_map_apply_match(struct route_map_rule_list *match_list,
                      const struct prefix *prefix, route_map_object_t type,
                      void *object)
{
        route_map_result_t ret = RMAP_NOMATCH;
        struct route_map_rule *match;


        /* Check all match rule and if there is no match rule, go to the
           set statement. */
        if (!match_list->head)
                ret = RMAP_MATCH;
        else {
                for (match = match_list->head; match; match = match->next) {
                        /* Try each match statement in turn, If any do not
                           return
                           RMAP_MATCH, return, otherwise continue on to next
                           match
                           statement. All match statements must match for
                           end-result
                           to be a match. */
                        ret = (*match->cmd->func_apply)(match->value, prefix,
                                                        type, object);
                        if (ret != RMAP_MATCH)
                                return ret;
                }
        }
        return ret;
}

/* Apply route map to the object. */
route_map_result_t route_map_apply(struct route_map *map,
                                   const struct prefix *prefix,
                                   route_map_object_t type, void *object)
{
        static int recursion = 0;
        int ret = 0;
        struct route_map_index *index;
        struct route_map_rule *set;

        if (recursion > RMAP_RECURSION_LIMIT) {
                flog_warn(
                        EC_LIB_RMAP_RECURSION_LIMIT,
                        "route-map recursion limit (%d) reached, discarding route",
                        RMAP_RECURSION_LIMIT);
                recursion = 0;
                return RMAP_DENYMATCH;
        }

        if (map == NULL)
                return RMAP_DENYMATCH;

        map->applied++;
        for (index = map->head; index; index = index->next) {
                /* Apply this index. */
                index->applied++;
                ret = route_map_apply_match(&index->match_list, prefix, type,
                                            object);

                /* Now we apply the matrix from above */
                if (ret == RMAP_NOMATCH)
                        /* 'cont' from matrix - continue to next route-map
                         * sequence */
                        continue;
                else if (ret == RMAP_MATCH) {
                        if (index->type == RMAP_PERMIT)
                        /* 'action' */
                        {
                                /* permit+match must execute sets */
                                for (set = index->set_list.head; set;
                                     set = set->next)
                                        ret = (*set->cmd->func_apply)(
                                                set->value, prefix, type,
                                                object);

                                /* Call another route-map if available */
                                if (index->nextrm) {
                                        struct route_map *nextrm =
                                                route_map_lookup_by_name(
                                                        index->nextrm);

                                        if (nextrm) /* Target route-map found,
                                                       jump to it */
                                        {
                                                recursion++;
                                                ret = route_map_apply(
                                                        nextrm, prefix, type,
                                                        object);
                                                recursion--;
                                        }

                                        /* If nextrm returned 'deny', finish. */
                                        if (ret == RMAP_DENYMATCH)
                                                return ret;
                                }

                                switch (index->exitpolicy) {
                                case RMAP_EXIT:
                                        return ret;
                                case RMAP_NEXT:
                                        continue;
                                case RMAP_GOTO: {
                                        /* Find the next clause to jump to */
                                        struct route_map_index *next =
                                                index->next;
                                        int nextpref = index->nextpref;

                                        while (next && next->pref < nextpref) {
                                                index = next;
                                                next = next->next;
                                        }
                                        if (next == NULL) {
                                                /* No clauses match! */
                                                return ret;
                                        }
                                }
                                }
                        } else if (index->type == RMAP_DENY)
                        /* 'deny' */
                        {
                                return RMAP_DENYMATCH;
                        }
                }
        }
        /* Finally route-map does not match at all. */
        return RMAP_DENYMATCH;
}

void route_map_add_hook(void (*func)(const char *))
{
        route_map_master.add_hook = func;
}

void route_map_delete_hook(void (*func)(const char *))
{
        route_map_master.delete_hook = func;
}

void route_map_event_hook(void (*func)(route_map_event_t, const char *))
{
        route_map_master.event_hook = func;
}

/* Routines for route map dependency lists and dependency processing */
static bool route_map_rmap_hash_cmp(const void *p1, const void *p2)
{
        return (strcmp((const char *)p1, (const char *)p2) == 0);
}

static bool route_map_dep_hash_cmp(const void *p1, const void *p2)
{

        return (strcmp(((const struct route_map_dep *)p1)->dep_name,
                       (const char *)p2)
                == 0);
}

static void route_map_clear_reference(struct hash_backet *backet, void *arg)
{
        struct route_map_dep *dep = (struct route_map_dep *)backet->data;
        char *rmap_name;

        if (arg) {
                rmap_name =
                        (char *)hash_release(dep->dep_rmap_hash, (void *)arg);
                if (rmap_name) {
                        XFREE(MTYPE_ROUTE_MAP_NAME, rmap_name);
                }
                if (!dep->dep_rmap_hash->count) {
                        dep = hash_release(dep->this_hash,
                                           (void *)dep->dep_name);
                        hash_free(dep->dep_rmap_hash);
                        XFREE(MTYPE_ROUTE_MAP_NAME, dep->dep_name);
                        XFREE(MTYPE_ROUTE_MAP_DEP, dep);
                }
        }
}

static void route_map_clear_all_references(char *rmap_name)
{
        int i;

        for (i = 1; i < ROUTE_MAP_DEP_MAX; i++) {
                hash_iterate(route_map_dep_hash[i], route_map_clear_reference,
                             (void *)rmap_name);
        }
}

static void *route_map_dep_hash_alloc(void *p)
{
        char *dep_name = (char *)p;
        struct route_map_dep *dep_entry;

        dep_entry = XCALLOC(MTYPE_ROUTE_MAP_DEP, sizeof(struct route_map_dep));
        dep_entry->dep_name = XSTRDUP(MTYPE_ROUTE_MAP_NAME, dep_name);
        dep_entry->dep_rmap_hash =
                hash_create_size(8, route_map_dep_hash_make_key,
                                 route_map_rmap_hash_cmp, "Route Map Dep Hash");
        dep_entry->this_hash = NULL;

        return ((void *)dep_entry);
}

static void *route_map_name_hash_alloc(void *p)
{
        return ((void *)XSTRDUP(MTYPE_ROUTE_MAP_NAME, (const char *)p));
}

static unsigned int route_map_dep_hash_make_key(void *p)
{
        return (string_hash_make((char *)p));
}

static void route_map_print_dependency(struct hash_backet *backet, void *data)
{
        char *rmap_name = (char *)backet->data;
        char *dep_name = (char *)data;

        zlog_debug("%s: Dependency for %s: %s", __FUNCTION__, dep_name,
                   rmap_name);
}

static int route_map_dep_update(struct hash *dephash, const char *dep_name,
                                const char *rmap_name, route_map_event_t type)
{
        struct route_map_dep *dep = NULL;
        char *ret_map_name;
        char *dname, *rname;
        int ret = 0;

        dname = XSTRDUP(MTYPE_ROUTE_MAP_NAME, dep_name);
        rname = XSTRDUP(MTYPE_ROUTE_MAP_NAME, rmap_name);

        switch (type) {
        case RMAP_EVENT_PLIST_ADDED:
        case RMAP_EVENT_CLIST_ADDED:
        case RMAP_EVENT_ECLIST_ADDED:
        case RMAP_EVENT_ASLIST_ADDED:
        case RMAP_EVENT_LLIST_ADDED:
        case RMAP_EVENT_CALL_ADDED:
        case RMAP_EVENT_FILTER_ADDED:
                if (rmap_debug)
                        zlog_debug("%s: Adding dependency for %s in %s",
                                   __FUNCTION__, dep_name, rmap_name);
                dep = (struct route_map_dep *)hash_get(
                        dephash, dname, route_map_dep_hash_alloc);
                if (!dep) {
                        ret = -1;
                        goto out;
                }

                if (!dep->this_hash)
                        dep->this_hash = dephash;

                hash_get(dep->dep_rmap_hash, rname, route_map_name_hash_alloc);
                break;
        case RMAP_EVENT_PLIST_DELETED:
        case RMAP_EVENT_CLIST_DELETED:
        case RMAP_EVENT_ECLIST_DELETED:
        case RMAP_EVENT_ASLIST_DELETED:
        case RMAP_EVENT_LLIST_DELETED:
        case RMAP_EVENT_CALL_DELETED:
        case RMAP_EVENT_FILTER_DELETED:
                if (rmap_debug)
                        zlog_debug("%s: Deleting dependency for %s in %s",
                                   __FUNCTION__, dep_name, rmap_name);
                dep = (struct route_map_dep *)hash_get(dephash, dname, NULL);
                if (!dep) {
                        goto out;
                }

                ret_map_name = (char *)hash_release(dep->dep_rmap_hash, rname);
                if (ret_map_name)
                        XFREE(MTYPE_ROUTE_MAP_NAME, ret_map_name);

                if (!dep->dep_rmap_hash->count) {
                        dep = hash_release(dephash, dname);
                        hash_free(dep->dep_rmap_hash);
                        XFREE(MTYPE_ROUTE_MAP_NAME, dep->dep_name);
                        XFREE(MTYPE_ROUTE_MAP_DEP, dep);
                        dep = NULL;
                }
                break;
        default:
                break;
        }

        if (dep) {
                if (rmap_debug)
                        hash_iterate(dep->dep_rmap_hash,
                                     route_map_print_dependency, dname);
        }

out:
        XFREE(MTYPE_ROUTE_MAP_NAME, rname);
        XFREE(MTYPE_ROUTE_MAP_NAME, dname);
        return ret;
}

static struct hash *route_map_get_dep_hash(route_map_event_t event)
{
        struct hash *upd8_hash = NULL;

        switch (event) {
        case RMAP_EVENT_PLIST_ADDED:
        case RMAP_EVENT_PLIST_DELETED:
                upd8_hash = route_map_dep_hash[ROUTE_MAP_DEP_PLIST];
                break;
        case RMAP_EVENT_CLIST_ADDED:
        case RMAP_EVENT_CLIST_DELETED:
                upd8_hash = route_map_dep_hash[ROUTE_MAP_DEP_CLIST];
                break;
        case RMAP_EVENT_ECLIST_ADDED:
        case RMAP_EVENT_ECLIST_DELETED:
                upd8_hash = route_map_dep_hash[ROUTE_MAP_DEP_ECLIST];
                break;
        case RMAP_EVENT_ASLIST_ADDED:
        case RMAP_EVENT_ASLIST_DELETED:
                upd8_hash = route_map_dep_hash[ROUTE_MAP_DEP_ASPATH];
                break;
        case RMAP_EVENT_LLIST_ADDED:
        case RMAP_EVENT_LLIST_DELETED:
                upd8_hash = route_map_dep_hash[ROUTE_MAP_DEP_LCLIST];
                break;
        case RMAP_EVENT_CALL_ADDED:
        case RMAP_EVENT_CALL_DELETED:
                upd8_hash = route_map_dep_hash[ROUTE_MAP_DEP_RMAP];
                break;
        case RMAP_EVENT_FILTER_ADDED:
        case RMAP_EVENT_FILTER_DELETED:
                upd8_hash = route_map_dep_hash[ROUTE_MAP_DEP_FILTER];
                break;
        default:
                upd8_hash = NULL;
                break;
        }
        return (upd8_hash);
}

static void route_map_process_dependency(struct hash_backet *backet, void *data)
{
        char *rmap_name = (char *)backet->data;
        route_map_event_t type = (route_map_event_t)(ptrdiff_t)data;

        if (rmap_debug)
                zlog_debug("%s: Notifying %s of dependency",
                           __FUNCTION__, rmap_name);
        if (route_map_master.event_hook)
                (*route_map_master.event_hook)(type, rmap_name);
}

void route_map_upd8_dependency(route_map_event_t type, const char *arg,
                               const char *rmap_name)
{
        struct hash *upd8_hash = NULL;

        if ((upd8_hash = route_map_get_dep_hash(type))) {
                route_map_dep_update(upd8_hash, arg, rmap_name, type);

                if (type == RMAP_EVENT_CALL_ADDED) {
                        /* Execute hook. */
                        if (route_map_master.add_hook)
                                (*route_map_master.add_hook)(rmap_name);
                } else if (type == RMAP_EVENT_CALL_DELETED) {
                        /* Execute hook. */
                        if (route_map_master.delete_hook)
                                (*route_map_master.delete_hook)(rmap_name);
                }
        }
}

void route_map_notify_dependencies(const char *affected_name,
                                   route_map_event_t event)
{
        struct route_map_dep *dep;
        struct hash *upd8_hash;
        char *name;

        if (!affected_name)
                return;

        name = XSTRDUP(MTYPE_ROUTE_MAP_NAME, affected_name);

        if ((upd8_hash = route_map_get_dep_hash(event)) == NULL) {
                XFREE(MTYPE_ROUTE_MAP_NAME, name);
                return;
        }

        dep = (struct route_map_dep *)hash_get(upd8_hash, name, NULL);
        if (dep) {
                if (!dep->this_hash)
                        dep->this_hash = upd8_hash;

                hash_iterate(dep->dep_rmap_hash, route_map_process_dependency,
                             (void *)event);
        }

        XFREE(MTYPE_ROUTE_MAP_NAME, name);
}


/* VTY related functions. */
DEFUN (match_interface,
       match_interface_cmd,
       "match interface WORD",
       MATCH_STR
       "match first hop interface of route\n"
       "Interface name\n")
{
        int idx_word = 2;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_interface)
                return rmap_match_set_hook.match_interface(
                        vty, index, "interface", argv[idx_word]->arg,
                        RMAP_EVENT_MATCH_ADDED);
        return CMD_SUCCESS;
}

DEFUN (no_match_interface,
       no_match_interface_cmd,
       "no match interface [WORD]",
       NO_STR
       MATCH_STR
       "Match first hop interface of route\n"
       "Interface name\n")
{
        char *iface = (argc == 4) ? argv[3]->arg : NULL;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_interface)
                return rmap_match_set_hook.no_match_interface(
                        vty, index, "interface", iface,
                        RMAP_EVENT_MATCH_DELETED);
        return CMD_SUCCESS;
}


DEFUN (match_ip_address,
       match_ip_address_cmd,
       "match ip address <(1-199)|(1300-2699)|WORD>",
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")
{
        int idx_acl = 3;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ip_address)
                return rmap_match_set_hook.match_ip_address(
                        vty, index, "ip address", argv[idx_acl]->arg,
                        RMAP_EVENT_FILTER_ADDED);
        return CMD_SUCCESS;
}


DEFUN (no_match_ip_address,
       no_match_ip_address_cmd,
       "no match ip address [<(1-199)|(1300-2699)|WORD>]",
       NO_STR
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ip_address) {
                if (argc <= idx_word)
                        return rmap_match_set_hook.no_match_ip_address(
                                vty, index, "ip address", NULL,
                                RMAP_EVENT_FILTER_DELETED);
                return rmap_match_set_hook.no_match_ip_address(
                        vty, index, "ip address", argv[idx_word]->arg,
                        RMAP_EVENT_FILTER_DELETED);
        }
        return CMD_SUCCESS;
}


DEFUN (match_ip_address_prefix_list,
       match_ip_address_prefix_list_cmd,
       "match ip address prefix-list WORD",
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ip_address_prefix_list)
                return rmap_match_set_hook.match_ip_address_prefix_list(
                        vty, index, "ip address prefix-list",
                        argv[idx_word]->arg, RMAP_EVENT_PLIST_ADDED);
        return CMD_SUCCESS;
}


DEFUN (no_match_ip_address_prefix_list,
       no_match_ip_address_prefix_list_cmd,
       "no match ip address prefix-list [WORD]",
       NO_STR
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
        int idx_word = 5;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ip_address_prefix_list) {
                if (argc <= idx_word)
                        return rmap_match_set_hook
                                .no_match_ip_address_prefix_list(
                                        vty, index, "ip address prefix-list",
                                        NULL, RMAP_EVENT_PLIST_DELETED);
                return rmap_match_set_hook.no_match_ip_address_prefix_list(
                        vty, index, "ip address prefix-list",
                        argv[idx_word]->arg, RMAP_EVENT_PLIST_DELETED);
        }
        return CMD_SUCCESS;
}


DEFUN (match_ip_next_hop,
       match_ip_next_hop_cmd,
       "match ip next-hop <(1-199)|(1300-2699)|WORD>",
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")
{
        int idx_acl = 3;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ip_next_hop)
                return rmap_match_set_hook.match_ip_next_hop(
                        vty, index, "ip next-hop", argv[idx_acl]->arg,
                        RMAP_EVENT_FILTER_ADDED);
        return CMD_SUCCESS;
}


DEFUN (no_match_ip_next_hop,
       no_match_ip_next_hop_cmd,
       "no match ip next-hop [<(1-199)|(1300-2699)|WORD>]",
       NO_STR
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ip_next_hop) {
                if (argc <= idx_word)
                        return rmap_match_set_hook.no_match_ip_next_hop(
                                vty, index, "ip next-hop", NULL,
                                RMAP_EVENT_FILTER_DELETED);
                return rmap_match_set_hook.no_match_ip_next_hop(
                        vty, index, "ip next-hop", argv[idx_word]->arg,
                        RMAP_EVENT_FILTER_DELETED);
        }
        return CMD_SUCCESS;
}


DEFUN (match_ip_next_hop_prefix_list,
       match_ip_next_hop_prefix_list_cmd,
       "match ip next-hop prefix-list WORD",
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ip_next_hop_prefix_list)
                return rmap_match_set_hook.match_ip_next_hop_prefix_list(
                        vty, index, "ip next-hop prefix-list",
                        argv[idx_word]->arg, RMAP_EVENT_PLIST_ADDED);
        return CMD_SUCCESS;
}

DEFUN (no_match_ip_next_hop_prefix_list,
       no_match_ip_next_hop_prefix_list_cmd,
       "no match ip next-hop prefix-list [WORD]",
       NO_STR
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
        int idx_word = 5;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ip_next_hop) {
                if (argc <= idx_word)
                        return rmap_match_set_hook.no_match_ip_next_hop(
                                vty, index, "ip next-hop prefix-list", NULL,
                                RMAP_EVENT_PLIST_DELETED);
                return rmap_match_set_hook.no_match_ip_next_hop(
                        vty, index, "ip next-hop prefix-list",
                        argv[idx_word]->arg, RMAP_EVENT_PLIST_DELETED);
        }
        return CMD_SUCCESS;
}

DEFUN(match_ip_next_hop_type, match_ip_next_hop_type_cmd,
      "match ip next-hop type <blackhole>",
      MATCH_STR IP_STR
      "Match next-hop address of route\n"
      "Match entries by type\n"
      "Blackhole\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ip_next_hop_type)
                return rmap_match_set_hook.match_ip_next_hop_type(
                        vty, index, "ip next-hop type", argv[idx_word]->arg,
                        RMAP_EVENT_MATCH_ADDED);
        return CMD_SUCCESS;
}

DEFUN(no_match_ip_next_hop_type, no_match_ip_next_hop_type_cmd,
      "no match ip next-hop type [<blackhole>]",
      NO_STR MATCH_STR IP_STR
      "Match next-hop address of route\n"
      "Match entries by type\n"
      "Blackhole\n")
{
        int idx_word = 5;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ip_next_hop) {
                if (argc <= idx_word)
                        return rmap_match_set_hook.no_match_ip_next_hop(
                                vty, index, "ip next-hop type", NULL,
                                RMAP_EVENT_MATCH_DELETED);
                return rmap_match_set_hook.no_match_ip_next_hop(
                        vty, index, "ip next-hop type", argv[idx_word]->arg,
                        RMAP_EVENT_MATCH_DELETED);
        }
        return CMD_SUCCESS;
}


DEFUN (match_ipv6_address,
       match_ipv6_address_cmd,
       "match ipv6 address WORD",
       MATCH_STR
       IPV6_STR
       "Match IPv6 address of route\n"
       "IPv6 access-list name\n")
{
        int idx_word = 3;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ipv6_address)
                return rmap_match_set_hook.match_ipv6_address(
                        vty, index, "ipv6 address", argv[idx_word]->arg,
                        RMAP_EVENT_FILTER_ADDED);
        return CMD_SUCCESS;
}

DEFUN (no_match_ipv6_address,
       no_match_ipv6_address_cmd,
       "no match ipv6 address WORD",
       NO_STR
       MATCH_STR
       IPV6_STR
       "Match IPv6 address of route\n"
       "IPv6 access-list name\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ipv6_address)
                return rmap_match_set_hook.no_match_ipv6_address(
                        vty, index, "ipv6 address", argv[idx_word]->arg,
                        RMAP_EVENT_FILTER_DELETED);
        return CMD_SUCCESS;
}


DEFUN (match_ipv6_address_prefix_list,
       match_ipv6_address_prefix_list_cmd,
       "match ipv6 address prefix-list WORD",
       MATCH_STR
       IPV6_STR
       "Match address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ipv6_address_prefix_list)
                return rmap_match_set_hook.match_ipv6_address_prefix_list(
                        vty, index, "ipv6 address prefix-list",
                        argv[idx_word]->arg, RMAP_EVENT_PLIST_ADDED);
        return CMD_SUCCESS;
}

DEFUN (no_match_ipv6_address_prefix_list,
       no_match_ipv6_address_prefix_list_cmd,
       "no match ipv6 address prefix-list WORD",
       NO_STR
       MATCH_STR
       IPV6_STR
       "Match address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
        int idx_word = 5;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ipv6_address_prefix_list)
                return rmap_match_set_hook.no_match_ipv6_address_prefix_list(
                        vty, index, "ipv6 address prefix-list",
                        argv[idx_word]->arg, RMAP_EVENT_PLIST_DELETED);
        return CMD_SUCCESS;
}

DEFUN(match_ipv6_next_hop_type, match_ipv6_next_hop_type_cmd,
      "match ipv6 next-hop type <blackhole>",
      MATCH_STR IPV6_STR
      "Match address of route\n"
      "Match entries by type\n"
      "Blackhole\n")
{
        int idx_word = 4;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_ipv6_next_hop_type)
                return rmap_match_set_hook.match_ipv6_next_hop_type(
                        vty, index, "ipv6 next-hop type", argv[idx_word]->arg,
                        RMAP_EVENT_MATCH_ADDED);
        return CMD_SUCCESS;
}

DEFUN(no_match_ipv6_next_hop_type, no_match_ipv6_next_hop_type_cmd,
      "no match ipv6 next-hop type [<blackhole>]",
      NO_STR MATCH_STR IPV6_STR
      "Match address of route\n"
      "Match entries by type\n"
      "Blackhole\n")
{
        int idx_word = 5;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_ipv6_next_hop_type)
                return rmap_match_set_hook.no_match_ipv6_next_hop_type(
                        vty, index, "ipv6 next-hop type",
                        (argc <= idx_word) ? NULL : argv[idx_word]->arg,
                        RMAP_EVENT_MATCH_DELETED);
        return CMD_SUCCESS;
}

DEFUN (match_metric,
       match_metric_cmd,
       "match metric (0-4294967295)",
       MATCH_STR
       "Match metric of route\n"
       "Metric value\n")
{
        int idx_number = 2;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_metric)
                return rmap_match_set_hook.match_metric(vty, index, "metric",
                                                        argv[idx_number]->arg,
                                                        RMAP_EVENT_MATCH_ADDED);
        return CMD_SUCCESS;
}


DEFUN (no_match_metric,
       no_match_metric_cmd,
       "no match metric [(0-4294967295)]",
       NO_STR
       MATCH_STR
       "Match metric of route\n"
       "Metric value\n")
{
        int idx_number = 3;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_match_metric) {
                if (argc <= idx_number)
                        return rmap_match_set_hook.no_match_metric(
                                vty, index, "metric", NULL,
                                RMAP_EVENT_MATCH_DELETED);
                return rmap_match_set_hook.no_match_metric(
                        vty, index, "metric", argv[idx_number]->arg,
                        RMAP_EVENT_MATCH_DELETED);
        }
        return CMD_SUCCESS;
}


DEFUN (match_tag,
       match_tag_cmd,
       "match tag (1-4294967295)",
       MATCH_STR
       "Match tag of route\n"
       "Tag value\n")
{
        int idx_number = 2;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.match_tag)
                return rmap_match_set_hook.match_tag(vty, index, "tag",
                                                     argv[idx_number]->arg,
                                                     RMAP_EVENT_MATCH_ADDED);
        return CMD_SUCCESS;
}


DEFUN (no_match_tag,
       no_match_tag_cmd,
       "no match tag [(1-4294967295)]",
       NO_STR
       MATCH_STR
       "Match tag of route\n"
       "Tag value\n")
{
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        int idx = 0;
        char *arg = argv_find(argv, argc, "(1-4294967295)", &idx)
                            ? argv[idx]->arg
                            : NULL;

        if (rmap_match_set_hook.no_match_tag)
                return rmap_match_set_hook.no_match_tag(
                        vty, index, "tag", arg, RMAP_EVENT_MATCH_DELETED);
        return CMD_SUCCESS;
}


DEFUN (set_ip_nexthop,
       set_ip_nexthop_cmd,
       "set ip next-hop A.B.C.D",
       SET_STR
       IP_STR
       "Next hop address\n"
       "IP address of next hop\n")
{
        int idx_ipv4 = 3;
        union sockunion su;
        int ret;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        ret = str2sockunion(argv[idx_ipv4]->arg, &su);
        if (ret < 0) {
                vty_out(vty, "%% Malformed nexthop address\n");
                return CMD_WARNING_CONFIG_FAILED;
        }
        if (su.sin.sin_addr.s_addr == 0
            || IPV4_CLASS_DE(ntohl(su.sin.sin_addr.s_addr))) {
                vty_out(vty,
                        "%% nexthop address cannot be 0.0.0.0, multicast or reserved\n");
                return CMD_WARNING_CONFIG_FAILED;
        }

        if (rmap_match_set_hook.set_ip_nexthop)
                return rmap_match_set_hook.set_ip_nexthop(
                        vty, index, "ip next-hop", argv[idx_ipv4]->arg);
        return CMD_SUCCESS;
}


DEFUN (no_set_ip_nexthop,
       no_set_ip_nexthop_cmd,
       "no set ip next-hop [A.B.C.D]",
       NO_STR
       SET_STR
       IP_STR
       "Next hop address\n"
       "IP address of next hop\n")
{
        int idx = 0;
        VTY_DECLVAR_CONTEXT(route_map_index, index);
        const char *arg = NULL;

        if (argv_find(argv, argc, "A.B.C.D", &idx))
                arg = argv[idx]->arg;

        if (rmap_match_set_hook.no_set_ip_nexthop)
                return rmap_match_set_hook.no_set_ip_nexthop(
                        vty, index, "ip next-hop", arg);

        return CMD_SUCCESS;
}


DEFUN (set_ipv6_nexthop_local,
       set_ipv6_nexthop_local_cmd,
       "set ipv6 next-hop local X:X::X:X",
       SET_STR
       IPV6_STR
       "IPv6 next-hop address\n"
       "IPv6 local address\n"
       "IPv6 address of next hop\n")
{
        int idx_ipv6 = 4;
        struct in6_addr addr;
        int ret;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        ret = inet_pton(AF_INET6, argv[idx_ipv6]->arg, &addr);
        if (!ret) {
                vty_out(vty, "%% Malformed nexthop address\n");
                return CMD_WARNING_CONFIG_FAILED;
        }
        if (!IN6_IS_ADDR_LINKLOCAL(&addr)) {
                vty_out(vty, "%% Invalid link-local nexthop address\n");
                return CMD_WARNING_CONFIG_FAILED;
        }

        if (rmap_match_set_hook.set_ipv6_nexthop_local)
                return rmap_match_set_hook.set_ipv6_nexthop_local(
                        vty, index, "ipv6 next-hop local", argv[idx_ipv6]->arg);
        return CMD_SUCCESS;
}


DEFUN (no_set_ipv6_nexthop_local,
       no_set_ipv6_nexthop_local_cmd,
       "no set ipv6 next-hop local [X:X::X:X]",
       NO_STR
       SET_STR
       IPV6_STR
       "IPv6 next-hop address\n"
       "IPv6 local address\n"
       "IPv6 address of next hop\n")
{
        int idx_ipv6 = 5;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_set_ipv6_nexthop_local) {
                if (argc <= idx_ipv6)
                        return rmap_match_set_hook.no_set_ipv6_nexthop_local(
                                vty, index, "ipv6 next-hop local", NULL);
                return rmap_match_set_hook.no_set_ipv6_nexthop_local(
                        vty, index, "ipv6 next-hop local", argv[5]->arg);
        }
        return CMD_SUCCESS;
}

DEFUN (set_metric,
       set_metric_cmd,
       "set metric <(0-4294967295)|rtt|+rtt|-rtt|+metric|-metric>",
       SET_STR
       "Metric value for destination routing protocol\n"
       "Metric value\n"
       "Assign round trip time\n"
       "Add round trip time\n"
       "Subtract round trip time\n"
       "Add metric\n"
       "Subtract metric\n")
{
        int idx_number = 2;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        const char *pass = (argv[idx_number]->type == RANGE_TKN)
                                   ? argv[idx_number]->arg
                                   : argv[idx_number]->text;

        if (rmap_match_set_hook.set_metric)
                return rmap_match_set_hook.set_metric(vty, index, "metric",
                                                      pass);
        return CMD_SUCCESS;
}


DEFUN (no_set_metric,
       no_set_metric_cmd,
       "no set metric [(0-4294967295)]",
       NO_STR
       SET_STR
       "Metric value for destination routing protocol\n"
       "Metric value\n")
{
        int idx_number = 3;
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        if (rmap_match_set_hook.no_set_metric) {
                if (argc <= idx_number)
                        return rmap_match_set_hook.no_set_metric(
                                vty, index, "metric", NULL);
                return rmap_match_set_hook.no_set_metric(vty, index, "metric",
                                                         argv[idx_number]->arg);
        }
        return CMD_SUCCESS;
}


DEFUN (set_tag,
       set_tag_cmd,
       "set tag (1-4294967295)",
       SET_STR
       "Tag value for routing protocol\n"
       "Tag value\n")
{
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        int idx_number = 2;
        if (rmap_match_set_hook.set_tag)
                return rmap_match_set_hook.set_tag(vty, index, "tag",
                                                   argv[idx_number]->arg);
        return CMD_SUCCESS;
}


DEFUN (no_set_tag,
       no_set_tag_cmd,
       "no set tag [(1-4294967295)]",
       NO_STR
       SET_STR
       "Tag value for routing protocol\n"
       "Tag value\n")
{
        VTY_DECLVAR_CONTEXT(route_map_index, index);

        int idx_number = 3;
        if (rmap_match_set_hook.no_set_tag) {
                if (argc <= idx_number)
                        return rmap_match_set_hook.no_set_tag(vty, index, "tag",
                                                              NULL);
                return rmap_match_set_hook.no_set_tag(vty, index, "tag",
                                                      argv[idx_number]->arg);
        }
        return CMD_SUCCESS;
}


DEFUN_NOSH (route_map,
       route_map_cmd,
       "route-map WORD <deny|permit> (1-65535)",
       "Create route-map or enter route-map command mode\n"
       "Route map tag\n"
       "Route map denies set operations\n"
       "Route map permits set operations\n"
       "Sequence to insert to/delete from existing route-map entry\n")
{
        int idx_word = 1;
        int idx_permit_deny = 2;
        int idx_number = 3;
        struct route_map *map;
        struct route_map_index *index;
        char *endptr = NULL;
        int permit =
                argv[idx_permit_deny]->arg[0] == 'p' ? RMAP_PERMIT : RMAP_DENY;
        unsigned long pref = strtoul(argv[idx_number]->arg, &endptr, 10);
        const char *mapname = argv[idx_word]->arg;

        /* Get route map. */
        map = route_map_get(mapname);
        index = route_map_index_get(map, permit, pref);

        VTY_PUSH_CONTEXT(RMAP_NODE, index);
        return CMD_SUCCESS;
}

DEFUN (no_route_map_all,
       no_route_map_all_cmd,
       "no route-map WORD",
       NO_STR
       "Create route-map or enter route-map command mode\n"
       "Route map tag\n")
{
        int idx_word = 2;
        const char *mapname = argv[idx_word]->arg;
        struct route_map *map;

        map = route_map_lookup_by_name(mapname);
        if (map == NULL) {
                vty_out(vty, "%% Could not find route-map %s\n", mapname);
                return CMD_WARNING_CONFIG_FAILED;
        }

        route_map_delete(map);

        return CMD_SUCCESS;
}

DEFUN (no_route_map,
       no_route_map_cmd,
       "no route-map WORD <deny|permit> (1-65535)",
       NO_STR
       "Create route-map or enter route-map command mode\n"
       "Route map tag\n"
       "Route map denies set operations\n"
       "Route map permits set operations\n"
       "Sequence to insert to/delete from existing route-map entry\n")
{
        int idx_word = 2;
        int idx_permit_deny = 3;
        int idx_number = 4;
        struct route_map *map;
        struct route_map_index *index;
        char *endptr = NULL;
        int permit = strmatch(argv[idx_permit_deny]->text, "permit")
                             ? RMAP_PERMIT
                             : RMAP_DENY;
        const char *prefstr = argv[idx_number]->arg;
        const char *mapname = argv[idx_word]->arg;
        unsigned long pref = strtoul(prefstr, &endptr, 10);

        /* Existence check. */
        map = route_map_lookup_by_name(mapname);
        if (map == NULL) {
                vty_out(vty, "%% Could not find route-map %s\n", mapname);
                return CMD_WARNING_CONFIG_FAILED;
        }

        /* Lookup route map index. */
        index = route_map_index_lookup(map, permit, pref);
        if (index == NULL) {
                vty_out(vty, "%% Could not find route-map entry %s %s\n",
                        mapname, prefstr);
                return CMD_WARNING_CONFIG_FAILED;
        }

        /* Delete index from route map. */
        route_map_index_delete(index, 1);

        /* If this route rule is the last one, delete route map itself. */
        if (route_map_empty(map))
                route_map_delete(map);

        return CMD_SUCCESS;
}

DEFUN (rmap_onmatch_next,
       rmap_onmatch_next_cmd,
       "on-match next",
       "Exit policy on matches\n"
       "Next clause\n")
{
        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);

        if (index) {
                if (index->type == RMAP_DENY) {
                        /* Under a deny clause, match means it's finished. No
                         * need to set next */
                        vty_out(vty,
                                "on-match next not supported under route-map deny\n");
                        return CMD_WARNING_CONFIG_FAILED;
                }
                index->exitpolicy = RMAP_NEXT;
        }
        return CMD_SUCCESS;
}

DEFUN (no_rmap_onmatch_next,
       no_rmap_onmatch_next_cmd,
       "no on-match next",
       NO_STR
       "Exit policy on matches\n"
       "Next clause\n")
{
        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);

        if (index)
                index->exitpolicy = RMAP_EXIT;

        return CMD_SUCCESS;
}

DEFUN (rmap_onmatch_goto,
       rmap_onmatch_goto_cmd,
       "on-match goto (1-65535)",
       "Exit policy on matches\n"
       "Goto Clause number\n"
       "Number\n")
{
        int idx = 0;
        char *num = argv_find(argv, argc, "(1-65535)", &idx) ? argv[idx]->arg
                                                             : NULL;

        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);
        int d = 0;

        if (index) {
                if (index->type == RMAP_DENY) {
                        /* Under a deny clause, match means it's finished. No
                         * need to go anywhere */
                        vty_out(vty,
                                "on-match goto not supported under route-map deny\n");
                        return CMD_WARNING_CONFIG_FAILED;
                }

                if (num)
                        d = strtoul(num, NULL, 10);
                else
                        d = index->pref + 1;

                if (d <= index->pref) {
                        /* Can't allow you to do that, Dave */
                        vty_out(vty, "can't jump backwards in route-maps\n");
                        return CMD_WARNING_CONFIG_FAILED;
                } else {
                        index->exitpolicy = RMAP_GOTO;
                        index->nextpref = d;
                }
        }
        return CMD_SUCCESS;
}

DEFUN (no_rmap_onmatch_goto,
       no_rmap_onmatch_goto_cmd,
       "no on-match goto",
       NO_STR
       "Exit policy on matches\n"
       "Goto Clause number\n")
{
        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);

        if (index)
                index->exitpolicy = RMAP_EXIT;

        return CMD_SUCCESS;
}

/* Cisco/GNU Zebra compatibility aliases */
/* ALIAS_FIXME */
DEFUN (rmap_continue,
       rmap_continue_cmd,
       "continue (1-65535)",
       "Continue on a different entry within the route-map\n"
       "Route-map entry sequence number\n")
{
        return rmap_onmatch_goto(self, vty, argc, argv);
}

/* ALIAS_FIXME */
DEFUN (no_rmap_continue,
       no_rmap_continue_cmd,
       "no continue [(1-65535)]",
       NO_STR
       "Continue on a different entry within the route-map\n"
       "Route-map entry sequence number\n")
{
        return no_rmap_onmatch_goto(self, vty, argc, argv);
}


DEFUN (rmap_show_name,
       rmap_show_name_cmd,
       "show route-map [WORD]",
       SHOW_STR
       "route-map information\n"
       "route-map name\n")
{
        int idx_word = 2;
        const char *name = (argc == 3) ? argv[idx_word]->arg : NULL;
        return vty_show_route_map(vty, name);
}

DEFUN (rmap_call,
       rmap_call_cmd,
       "call WORD",
       "Jump to another Route-Map after match+set\n"
       "Target route-map name\n")
{
        int idx_word = 1;
        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);
        const char *rmap = argv[idx_word]->arg;

        assert(index);

        if (index->nextrm) {
                route_map_upd8_dependency(RMAP_EVENT_CALL_DELETED,
                                          index->nextrm, index->map->name);
                XFREE(MTYPE_ROUTE_MAP_NAME, index->nextrm);
        }
        index->nextrm = XSTRDUP(MTYPE_ROUTE_MAP_NAME, rmap);

        /* Execute event hook. */
        route_map_upd8_dependency(RMAP_EVENT_CALL_ADDED, index->nextrm,
                                  index->map->name);
        return CMD_SUCCESS;
}

DEFUN (no_rmap_call,
       no_rmap_call_cmd,
       "no call",
       NO_STR
       "Jump to another Route-Map after match+set\n")
{
        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);

        if (index->nextrm) {
                route_map_upd8_dependency(RMAP_EVENT_CALL_DELETED,
                                          index->nextrm, index->map->name);
                XFREE(MTYPE_ROUTE_MAP_NAME, index->nextrm);
                index->nextrm = NULL;
        }

        return CMD_SUCCESS;
}

DEFUN (rmap_description,
       rmap_description_cmd,
       "description LINE...",
       "Route-map comment\n"
       "Comment describing this route-map rule\n")
{
        int idx_line = 1;
        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);

        if (index) {
                if (index->description)
                        XFREE(MTYPE_TMP, index->description);
                index->description = argv_concat(argv, argc, idx_line);
        }
        return CMD_SUCCESS;
}

DEFUN (no_rmap_description,
       no_rmap_description_cmd,
       "no description",
       NO_STR
       "Route-map comment\n")
{
        struct route_map_index *index = VTY_GET_CONTEXT(route_map_index);

        if (index) {
                if (index->description)
                        XFREE(MTYPE_TMP, index->description);
                index->description = NULL;
        }
        return CMD_SUCCESS;
}

/* Configuration write function. */
static int route_map_config_write(struct vty *vty)
{
        struct route_map *map;
        struct route_map_index *index;
        struct route_map_rule *rule;
        int first = 1;
        int write = 0;

        for (map = route_map_master.head; map; map = map->next)
                for (index = map->head; index; index = index->next) {
                        if (!first)
                                vty_out(vty, "!\n");
                        else
                                first = 0;

                        vty_out(vty, "route-map %s %s %d\n", map->name,
                                route_map_type_str(index->type), index->pref);

                        if (index->description)
                                vty_out(vty, " description %s\n",
                                        index->description);

                        for (rule = index->match_list.head; rule;
                             rule = rule->next)
                                vty_out(vty, " match %s %s\n", rule->cmd->str,
                                        rule->rule_str ? rule->rule_str : "");

                        for (rule = index->set_list.head; rule;
                             rule = rule->next)
                                vty_out(vty, " set %s %s\n", rule->cmd->str,
                                        rule->rule_str ? rule->rule_str : "");
                        if (index->nextrm)
                                vty_out(vty, " call %s\n", index->nextrm);
                        if (index->exitpolicy == RMAP_GOTO)
                                vty_out(vty, " on-match goto %d\n",
                                        index->nextpref);
                        if (index->exitpolicy == RMAP_NEXT)
                                vty_out(vty, " on-match next\n");

                        write++;
                }
        return write;
}

/* Route map node structure. */
static struct cmd_node rmap_node = {RMAP_NODE, "%s(config-route-map)# ", 1};

/* Common route map rules */

void *route_map_rule_tag_compile(const char *arg)
{
        unsigned long int tmp;
        char *endptr;
        route_tag_t *tag;

        errno = 0;
        tmp = strtoul(arg, &endptr, 0);
        if (arg[0] == '\0' || *endptr != '\0' || errno || tmp > ROUTE_TAG_MAX)
                return NULL;

        tag = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(*tag));
        *tag = tmp;

        return tag;
}

void route_map_rule_tag_free(void *rule)
{
        XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
}

void route_map_finish(void)
{
        int i;

        vector_free(route_match_vec);
        route_match_vec = NULL;
        vector_free(route_set_vec);
        route_set_vec = NULL;

        /*
         * All protocols are setting these to NULL
         * by default on shutdown( route_map_finish )
         * Why are we making them do this work?
         */
        route_map_master.add_hook = NULL;
        route_map_master.delete_hook = NULL;
        route_map_master.event_hook = NULL;

        /* cleanup route_map */
        while (route_map_master.head) {
                struct route_map *map = route_map_master.head;
                map->to_be_processed = false;
                route_map_delete(map);
        }

        for (i = 1; i < ROUTE_MAP_DEP_MAX; i++) {
                hash_free(route_map_dep_hash[i]);
                route_map_dep_hash[i] = NULL;
        }

        hash_free(route_map_master_hash);
        route_map_master_hash = NULL;
}

static void rmap_autocomplete(vector comps, struct cmd_token *token)
{
        struct route_map *map;

        for (map = route_map_master.head; map; map = map->next)
                vector_set(comps, XSTRDUP(MTYPE_COMPLETION, map->name));
}

static const struct cmd_variable_handler rmap_var_handlers[] = {
        {/* "route-map WORD" */
         .varname = "route_map",
         .completions = rmap_autocomplete},
        {.tokenname = "ROUTEMAP_NAME", .completions = rmap_autocomplete},
        {.tokenname = "RMAP_NAME", .completions = rmap_autocomplete},
        {.completions = NULL}};

/* Initialization of route map vector. */
void route_map_init(void)
{
        int i;

        /* Make vector for match and set. */
        route_match_vec = vector_init(1);
        route_set_vec = vector_init(1);
        route_map_master_hash =
                hash_create_size(8, route_map_hash_key_make, route_map_hash_cmp,
                                 "Route Map Master Hash");

        for (i = 1; i < ROUTE_MAP_DEP_MAX; i++)
                route_map_dep_hash[i] = hash_create_size(
                        8, route_map_dep_hash_make_key, route_map_dep_hash_cmp,
                        "Route Map Dep Hash");

        cmd_variable_handler_register(rmap_var_handlers);

        /* Install route map top node. */
        install_node(&rmap_node, route_map_config_write);

        /* Install route map commands. */
        install_default(RMAP_NODE);
        install_element(CONFIG_NODE, &route_map_cmd);
        install_element(CONFIG_NODE, &no_route_map_cmd);
        install_element(CONFIG_NODE, &no_route_map_all_cmd);

        /* Install the on-match stuff */
        install_element(RMAP_NODE, &route_map_cmd);
        install_element(RMAP_NODE, &rmap_onmatch_next_cmd);
        install_element(RMAP_NODE, &no_rmap_onmatch_next_cmd);
        install_element(RMAP_NODE, &rmap_onmatch_goto_cmd);
        install_element(RMAP_NODE, &no_rmap_onmatch_goto_cmd);
        install_element(RMAP_NODE, &rmap_continue_cmd);
        install_element(RMAP_NODE, &no_rmap_continue_cmd);

        /* Install the continue stuff (ALIAS of on-match). */

        /* Install the call stuff. */
        install_element(RMAP_NODE, &rmap_call_cmd);
        install_element(RMAP_NODE, &no_rmap_call_cmd);

        /* Install description commands. */
        install_element(RMAP_NODE, &rmap_description_cmd);
        install_element(RMAP_NODE, &no_rmap_description_cmd);

        /* Install show command */
        install_element(ENABLE_NODE, &rmap_show_name_cmd);

        install_element(RMAP_NODE, &match_interface_cmd);
        install_element(RMAP_NODE, &no_match_interface_cmd);

        install_element(RMAP_NODE, &match_ip_address_cmd);
        install_element(RMAP_NODE, &no_match_ip_address_cmd);

        install_element(RMAP_NODE, &match_ip_address_prefix_list_cmd);
        install_element(RMAP_NODE, &no_match_ip_address_prefix_list_cmd);

        install_element(RMAP_NODE, &match_ip_next_hop_cmd);
        install_element(RMAP_NODE, &no_match_ip_next_hop_cmd);

        install_element(RMAP_NODE, &match_ip_next_hop_prefix_list_cmd);
        install_element(RMAP_NODE, &no_match_ip_next_hop_prefix_list_cmd);

        install_element(RMAP_NODE, &match_ip_next_hop_type_cmd);
        install_element(RMAP_NODE, &no_match_ip_next_hop_type_cmd);

        install_element(RMAP_NODE, &match_ipv6_address_cmd);
        install_element(RMAP_NODE, &no_match_ipv6_address_cmd);

        install_element(RMAP_NODE, &match_ipv6_address_prefix_list_cmd);
        install_element(RMAP_NODE, &no_match_ipv6_address_prefix_list_cmd);

        install_element(RMAP_NODE, &match_ipv6_next_hop_type_cmd);
        install_element(RMAP_NODE, &no_match_ipv6_next_hop_type_cmd);

        install_element(RMAP_NODE, &match_metric_cmd);
        install_element(RMAP_NODE, &no_match_metric_cmd);

        install_element(RMAP_NODE, &match_tag_cmd);
        install_element(RMAP_NODE, &no_match_tag_cmd);

        install_element(RMAP_NODE, &set_ip_nexthop_cmd);
        install_element(RMAP_NODE, &no_set_ip_nexthop_cmd);

        install_element(RMAP_NODE, &set_ipv6_nexthop_local_cmd);
        install_element(RMAP_NODE, &no_set_ipv6_nexthop_local_cmd);

        install_element(RMAP_NODE, &set_metric_cmd);
        install_element(RMAP_NODE, &no_set_metric_cmd);

        install_element(RMAP_NODE, &set_tag_cmd);
        install_element(RMAP_NODE, &no_set_tag_cmd);
}