Merge remote-tracking branch 'remotes/bonzini-gitlab/tags/for-upstream' into staging
[qemu.git] / net / colo.h
1 /*
2 * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
3 * (a.k.a. Fault Tolerance or Continuous Replication)
4 *
5 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
6 * Copyright (c) 2016 FUJITSU LIMITED
7 * Copyright (c) 2016 Intel Corporation
8 *
9 * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2 or
12 * later. See the COPYING file in the top-level directory.
13 */
14
15 #ifndef NET_COLO_H
16 #define NET_COLO_H
17
18 #include "qemu/jhash.h"
19 #include "qemu/timer.h"
20 #include "net/eth.h"
21
22 #define HASHTABLE_MAX_SIZE 16384
23
24 #ifndef IPPROTO_DCCP
25 #define IPPROTO_DCCP 33
26 #endif
27
28 #ifndef IPPROTO_SCTP
29 #define IPPROTO_SCTP 132
30 #endif
31
32 #ifndef IPPROTO_UDPLITE
33 #define IPPROTO_UDPLITE 136
34 #endif
35
36 typedef struct Packet {
37 void *data;
38 union {
39 uint8_t *network_header;
40 struct ip *ip;
41 };
42 uint8_t *transport_header;
43 int size;
44 /* Time of packet creation, in wall clock ms */
45 int64_t creation_ms;
46 /* Get vnet_hdr_len from filter */
47 uint32_t vnet_hdr_len;
48 uint32_t tcp_seq; /* sequence number */
49 uint32_t tcp_ack; /* acknowledgement number */
50 /* the sequence number of the last byte of the packet */
51 uint32_t seq_end;
52 uint8_t header_size; /* the header length */
53 uint16_t payload_size; /* the payload length */
54 /* record the payload offset(the length that has been compared) */
55 uint16_t offset;
56 uint8_t flags; /* Flags(aka Control bits) */
57 } Packet;
58
59 typedef struct ConnectionKey {
60 /* (src, dst) must be grouped, in the same way than in IP header */
61 struct in_addr src;
62 struct in_addr dst;
63 uint16_t src_port;
64 uint16_t dst_port;
65 uint8_t ip_proto;
66 } QEMU_PACKED ConnectionKey;
67
68 typedef struct Connection {
69 /* connection primary send queue: element type: Packet */
70 GQueue primary_list;
71 /* connection secondary send queue: element type: Packet */
72 GQueue secondary_list;
73 /* flag to enqueue unprocessed_connections */
74 bool processing;
75 uint8_t ip_proto;
76 /* record the sequence number that has been compared */
77 uint32_t compare_seq;
78 /* the maximum of acknowledgement number in primary_list queue */
79 uint32_t pack;
80 /* the maximum of acknowledgement number in secondary_list queue */
81 uint32_t sack;
82 /* offset = secondary_seq - primary_seq */
83 uint32_t offset;
84
85 int tcp_state; /* TCP FSM state */
86 uint32_t fin_ack_seq; /* the seq of 'fin=1,ack=1' */
87 } Connection;
88
89 uint32_t connection_key_hash(const void *opaque);
90 int connection_key_equal(const void *opaque1, const void *opaque2);
91 int parse_packet_early(Packet *pkt);
92 void extract_ip_and_port(uint32_t tmp_ports, ConnectionKey *key, Packet *pkt);
93 void fill_connection_key(Packet *pkt, ConnectionKey *key);
94 void reverse_connection_key(ConnectionKey *key);
95 Connection *connection_new(ConnectionKey *key);
96 void connection_destroy(void *opaque);
97 Connection *connection_get(GHashTable *connection_track_table,
98 ConnectionKey *key,
99 GQueue *conn_list);
100 bool connection_has_tracked(GHashTable *connection_track_table,
101 ConnectionKey *key);
102 void connection_hashtable_reset(GHashTable *connection_track_table);
103 Packet *packet_new(const void *data, int size, int vnet_hdr_len);
104 void packet_destroy(void *opaque, void *user_data);
105 void packet_destroy_partial(void *opaque, void *user_data);
106
107 #endif /* NET_COLO_H */