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/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program 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 3 of the License, or
(at your option) any later version.
This program 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. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <pthread.h>
#include <stdbool.h>
#include <stdint.h>
#include "contrib/sockaddr.h"
#include "contrib/ucw/lists.h"
typedef struct {
node_t n;
struct sockaddr_storage addr;
struct sockaddr_storage via;
uint32_t time_ms;
} knot_unreachable_t;
typedef struct {
pthread_mutex_t mutex;
uint32_t ttl_ms;
list_t urs;
} knot_unreachables_t;
extern knot_unreachables_t *global_unreachables;
/*!
* \brief Allocate Unreachables structure.
*
* \param ttl TTL for unreachable in milliseconds.
*
* \return Allocated structure, or NULL.
*/
knot_unreachables_t *knot_unreachables_init(uint32_t ttl_ms);
/*!
* \brief Free Unreachables structure.
*/
void knot_unreachables_deinit(knot_unreachables_t **urs);
/*!
* \brief Get and/or set the TTL.
*
* \param urs Unreachables structure.
* \param new_ttl_ms New TTL value in milliseconds.
*
* \return Previous value of TTL.
*/
uint32_t knot_unreachables_ttl(knot_unreachables_t *urs, uint32_t new_ttl_ms);
/*!
* \brief Determine if given address is unreachable.
*
* \param urs Unreachables structure.
* \param addr Address and port in question.
* \param via Local outgoing address.
*
* \return True iff unreachable within TTL.
*/
bool knot_unreachable_is(knot_unreachables_t *urs,
const struct sockaddr_storage *addr,
const struct sockaddr_storage *via);
/*!
* \brief Add an unreachable into Unreachables structure.
*
* \param urs Unreachables structure.
* \param addr Address and port being unreachable.
* \param via Local outgoing address.
*/
void knot_unreachable_add(knot_unreachables_t *urs,
const struct sockaddr_storage *addr,
const struct sockaddr_storage *via);
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