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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Nexthop Group structure definition.
* Copyright (C) 2018 Cumulus Networks, Inc.
* Donald Sharp
*/
#ifndef __NEXTHOP_GROUP__
#define __NEXTHOP_GROUP__
#include <vty.h>
#include "json.h"
#ifdef __cplusplus
extern "C" {
#endif
struct nhg_resilience {
uint16_t buckets;
uint32_t idle_timer;
uint32_t unbalanced_timer;
uint64_t unbalanced_time;
};
/*
* What is a nexthop group?
*
* A nexthop group is a collection of nexthops that make up
* the ECMP path for the route.
*
* This module provides a proper abstraction to this idea.
*/
struct nexthop_group {
struct nexthop *nexthop;
struct nhg_resilience nhgr;
};
struct nexthop_group *nexthop_group_new(void);
void nexthop_group_delete(struct nexthop_group **nhg);
void nexthop_group_copy(struct nexthop_group *to,
const struct nexthop_group *from);
/*
* Copy a list of nexthops in 'nh' to an nhg, enforcing canonical sort order
*/
void nexthop_group_copy_nh_sorted(struct nexthop_group *nhg,
const struct nexthop *nh);
void copy_nexthops(struct nexthop **tnh, const struct nexthop *nh,
struct nexthop *rparent);
uint32_t nexthop_group_hash_no_recurse(const struct nexthop_group *nhg);
uint32_t nexthop_group_hash(const struct nexthop_group *nhg);
void nexthop_group_mark_duplicates(struct nexthop_group *nhg);
/* Add a nexthop to a list, enforcing the canonical sort order. */
void nexthop_group_add_sorted(struct nexthop_group *nhg,
struct nexthop *nexthop);
/* The following for loop allows to iterate over the nexthop
* structure of routes.
*
* head: The pointer to the first nexthop in the chain.
*
* nexthop: The pointer to the current nexthop, either in the
* top-level chain or in a resolved chain.
*/
#define ALL_NEXTHOPS(head, nhop) \
(nhop) = (head.nexthop); \
(nhop); \
(nhop) = nexthop_next(nhop)
#define ALL_NEXTHOPS_PTR(head, nhop) \
(nhop) = ((head)->nexthop); \
(nhop); \
(nhop) = nexthop_next(nhop)
#define NHGC_NAME_SIZE 80
struct nexthop_group_cmd {
RB_ENTRY(nexthop_group_cmd) nhgc_entry;
char name[NHGC_NAME_SIZE];
/* Name of group containing backup nexthops (if set) */
char backup_list_name[NHGC_NAME_SIZE];
struct nexthop_group nhg;
struct list *nhg_list;
QOBJ_FIELDS;
};
RB_HEAD(nhgc_entry_head, nexthp_group_cmd);
RB_PROTOTYPE(nhgc_entry_head, nexthop_group_cmd, nhgc_entry,
nexthop_group_cmd_compare)
DECLARE_QOBJ_TYPE(nexthop_group_cmd);
/*
* Initialize nexthop_groups. If you are interested in when
* a nexthop_group is added/deleted/modified, then set the
* appropriate callback functions to handle it in your
* code
*
* create - The creation of the nexthop group
* modify - Modification of the nexthop group when not changing a nexthop
* ( resilience as an example )
* add_nexthop - A nexthop is added to the NHG
* del_nexthop - A nexthop is deleted from the NHG
* destroy - The NHG is deleted
*/
void nexthop_group_init(
void (*create)(const char *name),
void (*modify)(const struct nexthop_group_cmd *nhgc),
void (*add_nexthop)(const struct nexthop_group_cmd *nhgc,
const struct nexthop *nhop),
void (*del_nexthop)(const struct nexthop_group_cmd *nhgc,
const struct nexthop *nhop),
void (*destroy)(const char *name));
void nexthop_group_enable_vrf(struct vrf *vrf);
void nexthop_group_disable_vrf(struct vrf *vrf);
void nexthop_group_interface_state_change(struct interface *ifp,
ifindex_t oldifindex);
extern struct nexthop *nexthop_exists(const struct nexthop_group *nhg,
const struct nexthop *nh);
/* This assumes ordered */
extern bool nexthop_group_equal_no_recurse(const struct nexthop_group *nhg1,
const struct nexthop_group *nhg2);
/* This assumes ordered */
extern bool nexthop_group_equal(const struct nexthop_group *nhg1,
const struct nexthop_group *nhg2);
extern struct nexthop_group_cmd *nhgc_find(const char *name);
extern void nexthop_group_write_nexthop_simple(struct vty *vty,
const struct nexthop *nh,
char *altifname);
extern void nexthop_group_write_nexthop(struct vty *vty,
const struct nexthop *nh);
extern void nexthop_group_json_nexthop(json_object *j,
const struct nexthop *nh);
/* Return the number of nexthops in this nhg */
extern uint8_t nexthop_group_nexthop_num(const struct nexthop_group *nhg);
extern uint8_t
nexthop_group_active_nexthop_num(const struct nexthop_group *nhg);
extern bool nexthop_group_has_label(const struct nexthop_group *nhg);
#ifdef __cplusplus
}
#endif
#endif
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