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/*
* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
* (a.k.a. Fault Tolerance or Continuous Replication)
*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
* Copyright (c) 2016 FUJITSU LIMITED
* Copyright (c) 2016 Intel Corporation
*
* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#ifndef QEMU_COLO_PROXY_H
#define QEMU_COLO_PROXY_H
#include "slirp/slirp.h"
#include "qemu/jhash.h"
#include "qemu/timer.h"
#include "slirp/tcp.h"
#define HASHTABLE_MAX_SIZE 16384
#ifndef IPPROTO_DCCP
#define IPPROTO_DCCP 33
#endif
#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP 132
#endif
#ifndef IPPROTO_UDPLITE
#define IPPROTO_UDPLITE 136
#endif
typedef struct Packet {
void *data;
union {
uint8_t *network_header;
struct ip *ip;
};
uint8_t *transport_header;
int size;
/* Time of packet creation, in wall clock ms */
int64_t creation_ms;
/* Get vnet_hdr_len from filter */
uint32_t vnet_hdr_len;
uint32_t tcp_seq; /* sequence number */
uint32_t tcp_ack; /* acknowledgement number */
/* the sequence number of the last byte of the packet */
uint32_t seq_end;
uint8_t header_size; /* the header length */
uint16_t payload_size; /* the payload length */
/* record the payload offset(the length that has been compared) */
uint16_t offset;
uint8_t flags; /* Flags(aka Control bits) */
} Packet;
typedef struct ConnectionKey {
/* (src, dst) must be grouped, in the same way than in IP header */
struct in_addr src;
struct in_addr dst;
uint16_t src_port;
uint16_t dst_port;
uint8_t ip_proto;
} QEMU_PACKED ConnectionKey;
typedef struct Connection {
/* connection primary send queue: element type: Packet */
GQueue primary_list;
/* connection secondary send queue: element type: Packet */
GQueue secondary_list;
/* flag to enqueue unprocessed_connections */
bool processing;
uint8_t ip_proto;
/* record the sequence number that has been compared */
uint32_t compare_seq;
/* the maximum of acknowledgement number in primary_list queue */
uint32_t pack;
/* the maximum of acknowledgement number in secondary_list queue */
uint32_t sack;
/* offset = secondary_seq - primary_seq */
tcp_seq offset;
int tcp_state; /* TCP FSM state */
tcp_seq fin_ack_seq; /* the seq of 'fin=1,ack=1' */
} Connection;
uint32_t connection_key_hash(const void *opaque);
int connection_key_equal(const void *opaque1, const void *opaque2);
int parse_packet_early(Packet *pkt);
void extract_ip_and_port(uint32_t tmp_ports, ConnectionKey *key, Packet *pkt);
void fill_connection_key(Packet *pkt, ConnectionKey *key);
void reverse_connection_key(ConnectionKey *key);
Connection *connection_new(ConnectionKey *key);
void connection_destroy(void *opaque);
Connection *connection_get(GHashTable *connection_track_table,
ConnectionKey *key,
GQueue *conn_list);
void connection_hashtable_reset(GHashTable *connection_track_table);
Packet *packet_new(const void *data, int size, int vnet_hdr_len);
void packet_destroy(void *opaque, void *user_data);
#endif /* QEMU_COLO_PROXY_H */
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