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  */
  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 (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  */
  71 void 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 }