/*
 * nhrp.h: next-hop resolution
 *
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __NHRP_H__
#define __NHRP_H__

#include <vnet/ip/ip.h>

/**
 * An NHRP entry represents the mapping between a peer on an interface in the overlay
 * and a next-hop address in the underlay.
 *  i.e. there's a multipoint tunnel providing the overlay (henace a peer on
 *   that tunnel) which is reachable via 'tunnel destination' address in the
 *   underlay.
 */
typedef struct nhrp_entry_t_ nhrp_entry_t;

/** accessors for the opaque struct */
extern u32 nhrp_entry_get_sw_if_index (const nhrp_entry_t * ne);
extern u32 nhrp_entry_get_fib_index (const nhrp_entry_t * ne);
extern const ip46_address_t *nhrp_entry_get_peer (const nhrp_entry_t * ne);
extern const fib_prefix_t *nhrp_entry_get_nh (const nhrp_entry_t * ne);
extern u8 *format_nhrp_entry (u8 * s, va_list * args);

/**
 * Create a new NHRP entry
 */
extern int nhrp_entry_add (u32 sw_if_index,
			   const ip46_address_t * peer,
			   u32 nh_table_id, const ip46_address_t * nh);

extern int nhrp_entry_del (u32 sw_if_index, const ip46_address_t * peer);

extern nhrp_entry_t *nhrp_entry_find (u32 sw_if_index,
				      const ip46_address_t * peer);
extern nhrp_entry_t *nhrp_entry_get (index_t nei);

extern void nhrp_entry_adj_stack (const nhrp_entry_t * ne, adj_index_t ai);

typedef walk_rc_t (*nhrp_walk_cb_t) (index_t nei, void *ctx);

extern void nhrp_walk (nhrp_walk_cb_t fn, void *ctx);
extern void nhrp_walk_itf (u32 sw_if_index, nhrp_walk_cb_t fn, void *ctx);

/**
 * Notifications for the creation and deletion of NHRP entries
 */
typedef void (*nhrp_entry_added_t) (const nhrp_entry_t * ne);
typedef void (*nhrp_entry_deleted_t) (const nhrp_entry_t * ne);

typedef struct nhrp_vft_t_
{
  nhrp_entry_added_t nv_added;
  nhrp_entry_deleted_t nv_deleted;
} nhrp_vft_t;

extern void nhrp_register (const nhrp_vft_t * vft);

#endif

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */