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1/*
2 * QEMU live migration
3 *
4 * Copyright IBM, Corp. 2008
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
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12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
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14 */
15
16#include "qemu-common.h"
1de7afc9 17#include "qemu/sockets.h"
caf71f86 18#include "migration/migration.h"
557ec5a0 19#include "migration/qemu-file.h"
737e150e 20#include "block/block.h"
6a1751b7 21#include "qemu/main-loop.h"
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22
23//#define DEBUG_MIGRATION_TCP
24
34c9dd8e 25#ifdef DEBUG_MIGRATION_TCP
d0f2c4c6 26#define DPRINTF(fmt, ...) \
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27 do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
28#else
d0f2c4c6 29#define DPRINTF(fmt, ...) \
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30 do { } while (0)
31#endif
32
233aa5c2 33static void tcp_wait_for_connect(int fd, void *opaque)
34c9dd8e 34{
22f00a44 35 MigrationState *s = opaque;
34c9dd8e 36
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37 if (fd < 0) {
38 DPRINTF("migrate connect error\n");
b352365f 39 s->file = NULL;
065e2813 40 migrate_fd_error(s);
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41 } else {
42 DPRINTF("migrate connect success\n");
b352365f 43 s->file = qemu_fopen_socket(fd, "wb");
065e2813 44 migrate_fd_connect(s);
34c9dd8e 45 }
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46}
47
f37afb5a 48void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
34c9dd8e 49{
f8bbc128 50 inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
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51}
52
53static void tcp_accept_incoming_migration(void *opaque)
54{
55 struct sockaddr_in addr;
56 socklen_t addrlen = sizeof(addr);
e0efb993 57 int s = (intptr_t)opaque;
34c9dd8e 58 QEMUFile *f;
511c0231 59 int c;
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60
61 do {
40ff6d7e 62 c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
c1d36665 63 } while (c == -1 && socket_error() == EINTR);
a6ef2909 64 qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
09bac73c 65 closesocket(s);
34c9dd8e 66
d0f2c4c6 67 DPRINTF("accepted migration\n");
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68
69 if (c == -1) {
70 fprintf(stderr, "could not accept migration connection\n");
a6ef2909 71 goto out;
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72 }
73
0cc3f3cc 74 f = qemu_fopen_socket(c, "rb");
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75 if (f == NULL) {
76 fprintf(stderr, "could not qemu_fopen socket\n");
77 goto out;
78 }
79
511c0231 80 process_incoming_migration(f);
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81 return;
82
34c9dd8e 83out:
09bac73c 84 closesocket(c);
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85}
86
43eaae28 87void tcp_start_incoming_migration(const char *host_port, Error **errp)
34c9dd8e 88{
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89 int s;
90
d5c5dacc 91 s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
d5c5dacc 92 if (s < 0) {
43eaae28 93 return;
ee86c61f 94 }
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95
96 qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
e0efb993 97 (void *)(intptr_t)s);
34c9dd8e 98}