LXR qemu/migration/socket.c

   1/*
   2 * QEMU live migration via socket
   3 *
   4 * Copyright Red Hat, Inc. 2009-2016
   5 *
   6 * Authors:
   7 *  Chris Lalancette <clalance@redhat.com>
   8 *  Daniel P. Berrange <berrange@redhat.com>
   9 *
  10 * This work is licensed under the terms of the GNU GPL, version 2.  See
  11 * the COPYING file in the top-level directory.
  12 *
  13 * Contributions after 2012-01-13 are licensed under the terms of the
  14 * GNU GPL, version 2 or (at your option) any later version.
  15 */
  16
  17#include "qemu/osdep.h"
  18
  19#include "qemu-common.h"
  20#include "qemu/error-report.h"
  21#include "qapi/error.h"
  22#include "channel.h"
  23#include "socket.h"
  24#include "migration.h"
  25#include "qemu-file.h"
  26#include "io/channel-socket.h"
  27#include "io/net-listener.h"
  28#include "trace.h"
  29
  30
  31static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
  32{
  33    SocketAddress *saddr;
  34
  35    saddr = g_new0(SocketAddress, 1);
  36    saddr->type = SOCKET_ADDRESS_TYPE_INET;
  37
  38    if (inet_parse(&saddr->u.inet, host_port, errp)) {
  39        qapi_free_SocketAddress(saddr);
  40        return NULL;
  41    }
  42
  43    return saddr;
  44}
  45
  46
  47static SocketAddress *unix_build_address(const char *path)
  48{
  49    SocketAddress *saddr;
  50
  51    saddr = g_new0(SocketAddress, 1);
  52    saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
  53    saddr->u.q_unix.path = g_strdup(path);
  54
  55    return saddr;
  56}
  57
  58
  59struct SocketConnectData {
  60    MigrationState *s;
  61    char *hostname;
  62};
  63
  64static void socket_connect_data_free(void *opaque)
  65{
  66    struct SocketConnectData *data = opaque;
  67    if (!data) {
  68        return;
  69    }
  70    g_free(data->hostname);
  71    g_free(data);
  72}
  73
  74static void socket_outgoing_migration(QIOTask *task,
  75                                      gpointer opaque)
  76{
  77    struct SocketConnectData *data = opaque;
  78    QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
  79    Error *err = NULL;
  80
  81    if (qio_task_propagate_error(task, &err)) {
  82        trace_migration_socket_outgoing_error(error_get_pretty(err));
  83    } else {
  84        trace_migration_socket_outgoing_connected(data->hostname);
  85    }
  86    migration_channel_connect(data->s, sioc, data->hostname, err);
  87    object_unref(OBJECT(sioc));
  88}
  89
  90static void socket_start_outgoing_migration(MigrationState *s,
  91                                            SocketAddress *saddr,
  92                                            Error **errp)
  93{
  94    QIOChannelSocket *sioc = qio_channel_socket_new();
  95    struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
  96
  97    data->s = s;
  98    if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
  99        data->hostname = g_strdup(saddr->u.inet.host);
 100    }
 101
 102    qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
 103    qio_channel_socket_connect_async(sioc,
 104                                     saddr,
 105                                     socket_outgoing_migration,
 106                                     data,
 107                                     socket_connect_data_free,
 108                                     NULL);
 109    qapi_free_SocketAddress(saddr);
 110}
 111
 112void tcp_start_outgoing_migration(MigrationState *s,
 113                                  const char *host_port,
 114                                  Error **errp)
 115{
 116    Error *err = NULL;
 117    SocketAddress *saddr = tcp_build_address(host_port, &err);
 118    if (!err) {
 119        socket_start_outgoing_migration(s, saddr, &err);
 120    }
 121    error_propagate(errp, err);
 122}
 123
 124void unix_start_outgoing_migration(MigrationState *s,
 125                                   const char *path,
 126                                   Error **errp)
 127{
 128    SocketAddress *saddr = unix_build_address(path);
 129    socket_start_outgoing_migration(s, saddr, errp);
 130}
 131
 132
 133static void socket_accept_incoming_migration(QIONetListener *listener,
 134                                             QIOChannelSocket *cioc,
 135                                             gpointer opaque)
 136{
 137    trace_migration_socket_incoming_accepted();
 138
 139    qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
 140    migration_channel_process_incoming(QIO_CHANNEL(cioc));
 141
 142    if (migration_has_all_channels()) {
 143        /* Close listening socket as its no longer needed */
 144        qio_net_listener_disconnect(listener);
 145
 146        object_unref(OBJECT(listener));
 147    }
 148}
 149
 150
 151static void socket_start_incoming_migration(SocketAddress *saddr,
 152                                            Error **errp)
 153{
 154    QIONetListener *listener = qio_net_listener_new();
 155
 156    qio_net_listener_set_name(listener, "migration-socket-listener");
 157
 158    if (qio_net_listener_open_sync(listener, saddr, errp) < 0) {
 159        object_unref(OBJECT(listener));
 160        return;
 161    }
 162
 163    qio_net_listener_set_client_func(listener,
 164                                     socket_accept_incoming_migration,
 165                                     NULL, NULL);
 166}
 167
 168void tcp_start_incoming_migration(const char *host_port, Error **errp)
 169{
 170    Error *err = NULL;
 171    SocketAddress *saddr = tcp_build_address(host_port, &err);
 172    if (!err) {
 173        socket_start_incoming_migration(saddr, &err);
 174    }
 175    qapi_free_SocketAddress(saddr);
 176    error_propagate(errp, err);
 177}
 178
 179void unix_start_incoming_migration(const char *path, Error **errp)
 180{
 181    SocketAddress *saddr = unix_build_address(path);
 182    socket_start_incoming_migration(saddr, errp);
 183    qapi_free_SocketAddress(saddr);
 184}
 185