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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2021 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef SHRPX_QUIC_CONNECTION_HANDLER_H
#define SHRPX_QUIC_CONNECTION_HANDLER_H
#include "shrpx.h"
#include <memory>
#include <unordered_map>
#include <string>
#include <vector>
#include <ngtcp2/ngtcp2.h>
#include <ev.h>
#include "shrpx_quic.h"
#include "network.h"
using namespace nghttp2;
namespace shrpx {
struct UpstreamAddr;
class ClientHandler;
class Worker;
// CloseWait handles packets received in close-wait (draining or
// closing period).
struct CloseWait {
CloseWait(Worker *worker, std::vector<ngtcp2_cid> scids,
std::vector<uint8_t> pkt, ev_tstamp period);
~CloseWait();
int handle_packet(const UpstreamAddr *faddr, const Address &remote_addr,
const Address &local_addr, const ngtcp2_pkt_info &pi,
std::span<const uint8_t> data);
Worker *worker;
// Source Connection IDs of the connection.
std::vector<ngtcp2_cid> scids;
// QUIC packet which is sent in response to the incoming packet. It
// might be empty.
std::vector<uint8_t> pkt;
// Close-wait (draining or closing period) timer.
ev_timer timer;
// The number of bytes received during close-wait period.
size_t bytes_recv;
// The number of bytes sent during close-wait period.
size_t bytes_sent;
// The number of packets received during close-wait period.
size_t num_pkts_recv;
// If the number of packets received reaches this number, send a
// QUIC packet.
size_t next_pkts_recv;
};
class QUICConnectionHandler {
public:
QUICConnectionHandler(Worker *worker);
~QUICConnectionHandler();
int handle_packet(const UpstreamAddr *faddr, const Address &remote_addr,
const Address &local_addr, const ngtcp2_pkt_info &pi,
std::span<const uint8_t> data);
// Send Retry packet. |ini_dcid| is the destination Connection ID
// which appeared in Client Initial packet. |ini_scid| is the
// source Connection ID which appeared in Client Initial packet.
int send_retry(const UpstreamAddr *faddr, uint32_t version,
std::span<const uint8_t> ini_dcid,
std::span<const uint8_t> ini_scid, const Address &remote_addr,
const Address &local_addr, size_t max_pktlen);
// Send Version Negotiation packet. |ini_dcid| is the destination
// Connection ID which appeared in Client Initial packet.
// |ini_scid| is the source Connection ID which appeared in Client
// Initial packet.
int send_version_negotiation(const UpstreamAddr *faddr, uint32_t version,
std::span<const uint8_t> ini_dcid,
std::span<const uint8_t> ini_scid,
const Address &remote_addr,
const Address &local_addr);
int send_stateless_reset(const UpstreamAddr *faddr, size_t pktlen,
std::span<const uint8_t> dcid,
const Address &remote_addr,
const Address &local_addr);
// Send Initial CONNECTION_CLOSE. |ini_dcid| is the destination
// Connection ID which appeared in Client Initial packet.
// |ini_scid| is the source Connection ID which appeared in Client
// Initial packet.
int send_connection_close(const UpstreamAddr *faddr, uint32_t version,
const ngtcp2_cid &ini_dcid,
const ngtcp2_cid &ini_scid,
const Address &remote_addr,
const Address &local_addr, uint64_t error_code,
size_t max_pktlen);
ClientHandler *
handle_new_connection(const UpstreamAddr *faddr, const Address &remote_addr,
const Address &local_addr, const ngtcp2_pkt_hd &hd,
const ngtcp2_cid *odcid, std::span<const uint8_t> token,
ngtcp2_token_type token_type);
void add_connection_id(const ngtcp2_cid &cid, ClientHandler *handler);
void remove_connection_id(const ngtcp2_cid &cid);
void add_close_wait(CloseWait *cw);
void remove_close_wait(const CloseWait *cw);
void on_stateless_reset_bucket_regen();
private:
Worker *worker_;
std::unordered_map<ngtcp2_cid, ClientHandler *> connections_;
std::unordered_map<ngtcp2_cid, CloseWait *> close_waits_;
ev_timer stateless_reset_bucket_regen_timer_;
size_t stateless_reset_bucket_;
};
} // namespace shrpx
#endif // SHRPX_QUIC_CONNECTION_HANDLER_H
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