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/* Copyright (C) 2022 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/>.
*/
/*!
* \file
*
* \brief General QUIC functionality.
*
* \addtogroup xdp
* @{
*/
#pragma once
#include "libknot/xdp/quic_conn.h"
#include "libknot/xdp/xdp.h"
struct knot_quic_creds;
struct knot_quic_session;
/*!
* \brief Gets data needed for session resumption.
*
* \param conn QUIC connection.
*
* \return QUIC session context.
*/
struct knot_quic_session *knot_xquic_session_save(knot_xquic_conn_t *conn);
/*!
* \brief Loads data needed for session resumption.
*
* \param conn QUIC connection.
* \param session QUIC session context.
*
* \return KNOT_E*
*/
int knot_xquic_session_load(knot_xquic_conn_t *conn, struct knot_quic_session *session);
/*!
* \brief Init server TLS certificate for DoQ.
*
* \param server Initializing for server-side (client otherwise).
* \param tls_cert X509 certificate PEM file path/name.
* \param tls_key Key PEM file path/name.
*
* \return Initialized creds.
*/
struct knot_quic_creds *knot_xquic_init_creds(bool server, const char *tls_cert,
const char *tls_key);
/*!
* \brief Init server TLS certificate for DoQ.
*/
void knot_xquic_free_creds(struct knot_quic_creds *creds);
/*!
* \brief Returns timeout value for the connection.
*/
uint64_t xquic_conn_get_timeout(knot_xquic_conn_t *conn);
/*!
* \brief Check if connection timed out due to inactivity.
*
* \param conn QUIC connection.
* \param now In/out: current monotonic time. Use zero first and reuse for
* next calls for optimization.
*
* \return True if the connection timed out idle.
*/
bool xquic_conn_timeout(knot_xquic_conn_t *conn, uint64_t *now);
/*!
* \brief Returns measured connection RTT in usecs.
*/
uint32_t knot_xquic_conn_rtt(knot_xquic_conn_t *conn);
/*!
* \brief Create new outgoing QUIC connection.
*
* \param table QUIC connections table to be added to.
* \param dest Destination IP address.
* \param via Source IP address.
* \param out_conn Out: new connection.
*
* \return KNOT_E*
*/
int knot_xquic_client(knot_xquic_table_t *table, struct sockaddr_in6 *dest,
struct sockaddr_in6 *via, knot_xquic_conn_t **out_conn);
/*!
* \brief Handle incoming QUIC packet.
*
* \param table QUIC connectoins table-
* \param msg Incoming XDP packet.
* \param idle_timeout Configured idle timeout for connections (in nanoseconds).
* \param out_conn Out: QUIC connection that this packet belongs to.
*
* \return KNOT_E*
*/
int knot_xquic_handle(knot_xquic_table_t *table, knot_xdp_msg_t *msg,
uint64_t idle_timeout, knot_xquic_conn_t **out_conn);
/*!
* \brief Send outgoing QUIC packet(s) for a connection.
*
* \param quic_table QUIC connection table.
* \param relay QUIC connection.
* \param sock XDP socket.
* \param in_msg Previous incomming packet for this connection.
* \param handle_ret Error returned from knot_xquic_handle() for incoming packet.
* \param max_msgs Maxmimum packets to be sent.
* \param ignore_lastbyte Cut off last byte of QUIC paylod.
*
* \return KNOT_E*
*/
int knot_xquic_send(knot_xquic_table_t *quic_table, knot_xquic_conn_t *relay,
knot_xdp_socket_t *sock, knot_xdp_msg_t *in_msg,
int handle_ret, unsigned max_msgs, bool ignore_lastbyte);
/*! @} */
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