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
  22/**
  23 * @migration_channel_process_incoming - Create new incoming migration channel
  24 *
  25 * Notice that TLS is special.  For it we listen in a listener socket,
  26 * and then create a new client socket from the TLS library.
  27 *
  28 * @ioc: Channel to which we are connecting
  29 */
  30void migration_channel_process_incoming(QIOChannel *ioc)
  31{
  32    MigrationState *s = migrate_get_current();
  33    Error *local_err = NULL;
  34
  35    trace_migration_set_incoming_channel(
  36        ioc, object_get_typename(OBJECT(ioc)));
  37
  38    if (s->parameters.tls_creds &&
  39        *s->parameters.tls_creds &&
  40        !object_dynamic_cast(OBJECT(ioc),
  41                             TYPE_QIO_CHANNEL_TLS)) {
  42        migration_tls_channel_process_incoming(s, ioc, &local_err);
  43    } else {
  44        migration_ioc_process_incoming(ioc, &local_err);
  45    }
  46
  47    if (local_err) {
  48        error_report_err(local_err);
  49    }
  50}
  51
  52
  53/**
  54 * @migration_channel_connect - Create new outgoing migration channel
  55 *
  56 * @s: Current migration state
  57 * @ioc: Channel to which we are connecting
  58 * @hostname: Where we want to connect
  59 * @error: Error indicating failure to connect, free'd here
  60 */
  61void migration_channel_connect(MigrationState *s,
  62                               QIOChannel *ioc,
  63                               const char *hostname,
  64                               Error *error)
  65{
  66    trace_migration_set_outgoing_channel(
  67        ioc, object_get_typename(OBJECT(ioc)), hostname, error);
  68
  69    if (!error) {
  70        if (s->parameters.tls_creds &&
  71            *s->parameters.tls_creds &&
  72            !object_dynamic_cast(OBJECT(ioc),
  73                                 TYPE_QIO_CHANNEL_TLS)) {
  74            migration_tls_channel_connect(s, ioc, hostname, &error);
  75
  76            if (!error) {
  77                /* tls_channel_connect will call back to this
  78                 * function after the TLS handshake,
  79                 * so we mustn't call migrate_fd_connect until then
  80                 */
  81
  82                return;
  83            }
  84        } else {
  85            QEMUFile *f = qemu_fopen_channel_output(ioc);
  86
  87            qemu_mutex_lock(&s->qemu_file_lock);
  88            s->to_dst_file = f;
  89            qemu_mutex_unlock(&s->qemu_file_lock);
  90        }
  91    }
  92    migrate_fd_connect(s, error);
  93    error_free(error);
  94}
  95