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