/* $NetBSD: ldp_peer.h,v 1.9 2020/04/22 23:53:27 joerg Exp $ */

/*-
 * Copyright (c) 2010 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Mihai Chelaru <kefren@NetBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _LDP_PEER_H_
#define _LDP_PEER_H_

#include "sys/types.h"
#include "sys/rbtree.h"
#include "sys/queue.h"
#include "netinet/in.h"

#include "mpls_routes.h"
#include "tlv.h"

struct ldp_peer_address {
        union sockunion address;
        SLIST_ENTRY(ldp_peer_address) addresses;
};

struct label_mapping {
        union sockunion address;
        uint    prefix;
        uint    label;
        rb_node_t mappings_node;
};

struct ldp_peer {
        /*
         * I add routes to address.
         * I maintain LDP TCP connection on transport_address.
         * I use ldp_id as peer identificator.
         */
        struct sockaddr *address, *transport_address;
        /* According to draft-ietf-mpls-ldp-ipv6-07 ID is IPv4 only for now */
        struct in_addr  ldp_id;
        /* TCP socket */
        int             socket;
        /* Rest of the peer parameters */
        uint16_t        holdtime, timeout;
        int             master; /* 0 if we're passive */
        int             state;  /* see below for possible states */
        time_t          established_t;  /* time when it did connect */
        /* Here I maintain all the addresses announced by a peer */
        SLIST_HEAD(,ldp_peer_address) ldp_peer_address_head;
        rb_tree_t label_mapping_tree;

        SLIST_ENTRY(ldp_peer) peers;
};
extern SLIST_HEAD(ldp_peer_head,ldp_peer) ldp_peer_head;

struct peer_map {
        struct ldp_peer *peer;
        struct label_mapping *lm;
};

/* LDP Peers States */
#define LDP_PEER_CONNECTING     0
#define LDP_PEER_CONNECTED      1
#define LDP_PEER_ESTABLISHED    2
#define LDP_PEER_HOLDDOWN       3

int     sockaddr_cmp(const struct sockaddr *, const struct sockaddr *);
void            ldp_peer_init(void);
struct ldp_peer * ldp_peer_new(const struct in_addr *, const struct sockaddr *,
                                const struct sockaddr *, uint16_t, int);
void            ldp_peer_holddown(struct ldp_peer *);
void            ldp_peer_delete(struct ldp_peer *);
struct ldp_peer * get_ldp_peer(const struct sockaddr *);
struct ldp_peer * get_ldp_peer_by_id(const struct in_addr *);
struct ldp_peer * get_ldp_peer_by_socket(int);
int add_ifaddresses(struct ldp_peer *, const struct al_tlv *);
int add_ifaddr(struct ldp_peer *, const struct sockaddr *);
int del_ifaddr(struct ldp_peer *, const struct sockaddr *);
struct ldp_peer_address * check_ifaddr(const struct ldp_peer *,
        const struct sockaddr *);
void print_bounded_addresses(const struct ldp_peer *);
void del_all_ifaddr(struct ldp_peer *);
int del_ifaddresses(struct ldp_peer *, const struct al_tlv *);

int ldp_peer_add_mapping(struct ldp_peer *, const struct sockaddr *, int, int);
int ldp_peer_delete_mapping(struct ldp_peer *, const struct sockaddr *, int);
void ldp_peer_delete_all_mappings(struct ldp_peer *);
void ldp_peer_holddown_all(void);

struct peer_map * ldp_test_mapping(const struct sockaddr *, int,
        const struct sockaddr *);
struct label_mapping * ldp_peer_lm_right(struct ldp_peer *,
        struct label_mapping *);

const char * ldp_state_to_name(int);

#endif  /* !_LDP_PEER_H_ */