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  */
  30 void 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  */
  61 void 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 }