LXR qemu/migration/tcp.c

   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 *
  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.
  14 */
  15
  16#include "qemu/osdep.h"
  17
  18#include "qemu-common.h"
  19#include "qemu/error-report.h"
  20#include "qemu/sockets.h"
  21#include "migration/migration.h"
  22#include "migration/qemu-file.h"
  23#include "block/block.h"
  24#include "qemu/main-loop.h"
  25
  26//#define DEBUG_MIGRATION_TCP
  27
  28#ifdef DEBUG_MIGRATION_TCP
  29#define DPRINTF(fmt, ...) \
  30    do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
  31#else
  32#define DPRINTF(fmt, ...) \
  33    do { } while (0)
  34#endif
  35
  36static void tcp_wait_for_connect(int fd, Error *err, void *opaque)
  37{
  38    MigrationState *s = opaque;
  39
  40    if (fd < 0) {
  41        DPRINTF("migrate connect error: %s\n", error_get_pretty(err));
  42        s->to_dst_file = NULL;
  43        migrate_fd_error(s);
  44    } else {
  45        DPRINTF("migrate connect success\n");
  46        s->to_dst_file = qemu_fopen_socket(fd, "wb");
  47        migrate_fd_connect(s);
  48    }
  49}
  50
  51void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
  52{
  53    inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
  54}
  55
  56static void tcp_accept_incoming_migration(void *opaque)
  57{
  58    struct sockaddr_in addr;
  59    socklen_t addrlen = sizeof(addr);
  60    int s = (intptr_t)opaque;
  61    QEMUFile *f;
  62    int c;
  63
  64    do {
  65        c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
  66    } while (c < 0 && errno == EINTR);
  67    qemu_set_fd_handler(s, NULL, NULL, NULL);
  68    closesocket(s);
  69
  70    DPRINTF("accepted migration\n");
  71
  72    if (c < 0) {
  73        error_report("could not accept migration connection (%s)",
  74                     strerror(errno));
  75        return;
  76    }
  77
  78    f = qemu_fopen_socket(c, "rb");
  79    if (f == NULL) {
  80        error_report("could not qemu_fopen socket");
  81        goto out;
  82    }
  83
  84    process_incoming_migration(f);
  85    return;
  86
  87out:
  88    closesocket(c);
  89}
  90
  91void tcp_start_incoming_migration(const char *host_port, Error **errp)
  92{
  93    int s;
  94
  95    s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
  96    if (s < 0) {
  97        return;
  98    }
  99
 100    qemu_set_fd_handler(s, tcp_accept_incoming_migration, NULL,
 101                        (void *)(intptr_t)s);
 102}
 103