LXR qemu/migration/channel.c

   1/*
   2 * QEMU live migration channel operations
   3 *
   4 * Copyright Red Hat, Inc. 2016
   5 *
   6 * Authors:
   7 *  Daniel P. Berrange <berrange@redhat.com>
   8 *
   9 * Contributions after 2012-01-13 are licensed under the terms of the
  10 * GNU GPL, version 2 or (at your option) any later version.
  11 */
  12
  13#include "qemu/osdep.h"
  14#include "channel.h"
  15#include "tls.h"
  16#include "migration.h"
  17#include "qemu-file-channel.h"
  18#include "trace.h"
  19#include "qapi/error.h"
  20#include "io/channel-tls.h"
  21#include "io/channel-socket.h"
  22#include "qemu/yank.h"
  23#include "yank_functions.h"
  24
  25/**
  26 * @migration_channel_process_incoming - Create new incoming migration channel
  27 *
  28 * Notice that TLS is special.  For it we listen in a listener socket,
  29 * and then create a new client socket from the TLS library.
  30 *
  31 * @ioc: Channel to which we are connecting
  32 */
  33void migration_channel_process_incoming(QIOChannel *ioc)
  34{
  35    MigrationState *s = migrate_get_current();
  36    Error *local_err = NULL;
  37
  38    trace_migration_set_incoming_channel(
  39        ioc, object_get_typename(OBJECT(ioc)));
  40
  41    if (s->parameters.tls_creds &&
  42        *s->parameters.tls_creds &&
  43        !object_dynamic_cast(OBJECT(ioc),
  44                             TYPE_QIO_CHANNEL_TLS)) {
  45        migration_tls_channel_process_incoming(s, ioc, &local_err);
  46    } else {
  47        if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET) ||
  48            object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS)) {
  49            yank_register_function(MIGRATION_YANK_INSTANCE,
  50                                   migration_yank_iochannel,
  51                                   QIO_CHANNEL(ioc));
  52        }
  53
  54        migration_ioc_process_incoming(ioc, &local_err);
  55    }
  56
  57    if (local_err) {
  58        error_report_err(local_err);
  59    }
  60}
  61
  62
  63/**
  64 * @migration_channel_connect - Create new outgoing migration channel
  65 *
  66 * @s: Current migration state
  67 * @ioc: Channel to which we are connecting
  68 * @hostname: Where we want to connect
  69 * @error: Error indicating failure to connect, free'd here
  70 */
  71void migration_channel_connect(MigrationState *s,
  72                               QIOChannel *ioc,
  73                               const char *hostname,
  74                               Error *error)
  75{
  76    trace_migration_set_outgoing_channel(
  77        ioc, object_get_typename(OBJECT(ioc)), hostname, error);
  78
  79    if (!error) {
  80        if (s->parameters.tls_creds &&
  81            *s->parameters.tls_creds &&
  82            !object_dynamic_cast(OBJECT(ioc),
  83                                 TYPE_QIO_CHANNEL_TLS)) {
  84            migration_tls_channel_connect(s, ioc, hostname, &error);
  85
  86            if (!error) {
  87                /* tls_channel_connect will call back to this
  88                 * function after the TLS handshake,
  89                 * so we mustn't call migrate_fd_connect until then
  90                 */
  91
  92                return;
  93            }
  94        } else {
  95            QEMUFile *f = qemu_fopen_channel_output(ioc);
  96
  97            if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET) ||
  98                object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS)) {
  99                yank_register_function(MIGRATION_YANK_INSTANCE,
 100                                       migration_yank_iochannel,
 101                                       QIO_CHANNEL(ioc));
 102            }
 103
 104            qemu_mutex_lock(&s->qemu_file_lock);
 105            s->to_dst_file = f;
 106            qemu_mutex_unlock(&s->qemu_file_lock);
 107        }
 108    }
 109    migrate_fd_connect(s, error);
 110    g_free(s->hostname);
 111    error_free(error);
 112}
 113