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        migration_ioc_register_yank(ioc);
  48        migration_ioc_process_incoming(ioc, &local_err);
  49    }
  50
  51    if (local_err) {
  52        error_report_err(local_err);
  53    }
  54}
  55
  56
  57/**
  58 * @migration_channel_connect - Create new outgoing migration channel
  59 *
  60 * @s: Current migration state
  61 * @ioc: Channel to which we are connecting
  62 * @hostname: Where we want to connect
  63 * @error: Error indicating failure to connect, free'd here
  64 */
  65void migration_channel_connect(MigrationState *s,
  66                               QIOChannel *ioc,
  67                               const char *hostname,
  68                               Error *error)
  69{
  70    trace_migration_set_outgoing_channel(
  71        ioc, object_get_typename(OBJECT(ioc)), hostname, error);
  72
  73    if (!error) {
  74        if (s->parameters.tls_creds &&
  75            *s->parameters.tls_creds &&
  76            !object_dynamic_cast(OBJECT(ioc),
  77                                 TYPE_QIO_CHANNEL_TLS)) {
  78            migration_tls_channel_connect(s, ioc, hostname, &error);
  79
  80            if (!error) {
  81                /* tls_channel_connect will call back to this
  82                 * function after the TLS handshake,
  83                 * so we mustn't call migrate_fd_connect until then
  84                 */
  85
  86                return;
  87            }
  88        } else {
  89            QEMUFile *f = qemu_fopen_channel_output(ioc);
  90
  91            migration_ioc_register_yank(ioc);
  92
  93            qemu_mutex_lock(&s->qemu_file_lock);
  94            s->to_dst_file = f;
  95            qemu_mutex_unlock(&s->qemu_file_lock);
  96        }
  97    }
  98    migrate_fd_connect(s, error);
  99    g_free(s->hostname);
 100    error_free(error);
 101}
 102