24525e93c1
After one round of checkpoint, the states between PVM and SVM become consistent, so it is unnecessary to adjust the sequence of net packets for old connections, besides, while failover happens, filter-rewriter will into failover mode that needn't handle the new TCP connection. Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: Zhang Chen <zhangckid@gmail.com> Signed-off-by: Zhang Chen <chen.zhang@intel.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
/*
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* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
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* (a.k.a. Fault Tolerance or Continuous Replication)
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*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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* Copyright (c) 2016 FUJITSU LIMITED
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* Copyright (c) 2016 Intel Corporation
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*
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* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_COLO_PROXY_H
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#define QEMU_COLO_PROXY_H
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#include "slirp/slirp.h"
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#include "qemu/jhash.h"
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#include "qemu/timer.h"
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#include "slirp/tcp.h"
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#define HASHTABLE_MAX_SIZE 16384
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#ifndef IPPROTO_DCCP
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#define IPPROTO_DCCP 33
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#endif
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#ifndef IPPROTO_SCTP
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#define IPPROTO_SCTP 132
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#endif
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#ifndef IPPROTO_UDPLITE
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#define IPPROTO_UDPLITE 136
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#endif
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typedef struct Packet {
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void *data;
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union {
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uint8_t *network_header;
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struct ip *ip;
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};
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uint8_t *transport_header;
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int size;
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/* Time of packet creation, in wall clock ms */
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int64_t creation_ms;
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/* Get vnet_hdr_len from filter */
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uint32_t vnet_hdr_len;
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uint32_t tcp_seq; /* sequence number */
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uint32_t tcp_ack; /* acknowledgement number */
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/* the sequence number of the last byte of the packet */
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uint32_t seq_end;
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uint8_t header_size; /* the header length */
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uint16_t payload_size; /* the payload length */
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/* record the payload offset(the length that has been compared) */
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uint16_t offset;
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uint8_t flags; /* Flags(aka Control bits) */
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} Packet;
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typedef struct ConnectionKey {
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/* (src, dst) must be grouped, in the same way than in IP header */
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struct in_addr src;
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struct in_addr dst;
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uint16_t src_port;
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uint16_t dst_port;
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uint8_t ip_proto;
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} QEMU_PACKED ConnectionKey;
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typedef struct Connection {
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/* connection primary send queue: element type: Packet */
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GQueue primary_list;
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/* connection secondary send queue: element type: Packet */
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GQueue secondary_list;
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/* flag to enqueue unprocessed_connections */
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bool processing;
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uint8_t ip_proto;
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/* record the sequence number that has been compared */
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uint32_t compare_seq;
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/* the maximum of acknowledgement number in primary_list queue */
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uint32_t pack;
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/* the maximum of acknowledgement number in secondary_list queue */
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uint32_t sack;
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/* offset = secondary_seq - primary_seq */
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tcp_seq offset;
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int tcp_state; /* TCP FSM state */
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tcp_seq fin_ack_seq; /* the seq of 'fin=1,ack=1' */
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} Connection;
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uint32_t connection_key_hash(const void *opaque);
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int connection_key_equal(const void *opaque1, const void *opaque2);
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int parse_packet_early(Packet *pkt);
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void extract_ip_and_port(uint32_t tmp_ports, ConnectionKey *key, Packet *pkt);
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void fill_connection_key(Packet *pkt, ConnectionKey *key);
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void reverse_connection_key(ConnectionKey *key);
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Connection *connection_new(ConnectionKey *key);
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void connection_destroy(void *opaque);
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Connection *connection_get(GHashTable *connection_track_table,
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ConnectionKey *key,
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GQueue *conn_list);
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bool connection_has_tracked(GHashTable *connection_track_table,
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ConnectionKey *key);
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void connection_hashtable_reset(GHashTable *connection_track_table);
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Packet *packet_new(const void *data, int size, int vnet_hdr_len);
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void packet_destroy(void *opaque, void *user_data);
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#endif /* QEMU_COLO_PROXY_H */
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