// SPDX-License-Identifier: MIT
/*
Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
*/

#ifndef BABEL_INTERFACE_H
#define BABEL_INTERFACE_H

#include <zebra.h>
#include "zclient.h"
#include "vty.h"
#include "distribute.h"

#define CONFIG_DEFAULT 0
#define CONFIG_NO 1
#define CONFIG_YES 2

/* babeld interface information */
struct babel_interface {
    unsigned short flags;                     /* see below */
    unsigned short cost;
    int channel;
    struct timeval hello_timeout;
    struct timeval update_timeout;
    struct timeval flush_timeout;
    struct timeval update_flush_timeout;
    unsigned char *ipv4;
    int buffered;
    int bufsize;
    /* Relative position of the Hello message in the send buffer, or
       (-1) if there is none. */
    int buffered_hello;
    char have_buffered_id;
    char have_buffered_nh;
    char have_buffered_prefix;
    unsigned char buffered_id[8];
    unsigned char buffered_nh[4];
    unsigned char buffered_prefix[16];
    unsigned char *sendbuf;
    struct buffered_update *buffered_updates;
    int num_buffered_updates;
    int update_bufsize;
    time_t bucket_time;
    unsigned int bucket;
    time_t last_update_time;
    unsigned short hello_seqno;
    unsigned hello_interval;
    unsigned update_interval;
    /* A higher value means we forget old RTT samples faster. Must be
       between 1 and 256, inclusive. */
    unsigned int rtt_decay;
    /* Parameters for computing the cost associated to RTT. */
    unsigned int rtt_min;
    unsigned int rtt_max;
    unsigned int max_rtt_penalty;

    /* For filter type slot. */
    struct access_list *list[DISTRIBUTE_MAX];                 /* Access-list. */
    struct prefix_list *prefix[DISTRIBUTE_MAX];               /* Prefix-list. */
};

typedef struct babel_interface babel_interface_nfo;
static inline babel_interface_nfo* babel_get_if_nfo(struct interface *ifp)
{
    return ((babel_interface_nfo*) ifp->info);
}

/* babel_interface_nfo flags */
#define BABEL_IF_IS_UP         (1 << 0)
#define BABEL_IF_WIRED         (1 << 1)
#define BABEL_IF_SPLIT_HORIZON (1 << 2)
#define BABEL_IF_LQ            (1 << 3)
#define BABEL_IF_FARAWAY       (1 << 4)
#define BABEL_IF_TIMESTAMPS    (1 << 5)

/* Only INTERFERING can appear on the wire. */
#define BABEL_IF_CHANNEL_UNKNOWN 0
#define BABEL_IF_CHANNEL_INTERFERING 255
#define BABEL_IF_CHANNEL_NONINTERFERING -2

static inline int
if_up(struct interface *ifp)
{
    return (if_is_operative(ifp) &&
            CHECK_FLAG(babel_get_if_nfo(ifp)->flags, BABEL_IF_IS_UP));
}

struct buffered_update {
    unsigned char id[8];
    unsigned char prefix[16];
    unsigned char plen;
    unsigned char pad[3];
};

/* init function */
void babel_if_init(void);

/* Callback functions for zebra client */
int babel_interface_up (int, struct zclient *, zebra_size_t, vrf_id_t);
int babel_interface_down (int, struct zclient *, zebra_size_t, vrf_id_t);
int babel_interface_add (int, struct zclient *, zebra_size_t, vrf_id_t);
int babel_interface_delete (int, struct zclient *, zebra_size_t, vrf_id_t);
int babel_interface_address_add (int, struct zclient *, zebra_size_t, vrf_id_t);
int babel_interface_address_delete (int, struct zclient *, zebra_size_t, vrf_id_t);

int babel_ifp_create(struct interface *ifp);
int babel_ifp_up(struct interface *ifp);
int babel_ifp_down(struct interface *ifp);
int babel_ifp_destroy(struct interface *ifp);

unsigned jitter(babel_interface_nfo *, int);
unsigned update_jitter(babel_interface_nfo *babel_ifp, int urgent);
/* return "true" if "address" is one of our ipv6 addresses */
int is_interface_ll_address(struct interface *ifp, const unsigned char *address);
/* Send retraction to all, and reset all interfaces statistics. */
void babel_interface_close_all(void);
extern int babel_enable_if_config_write (struct vty *);


#endif